diff --git a/src/graphics/engine/camera.cpp b/src/graphics/engine/camera.cpp
index 07b18364..ef6fb998 100644
--- a/src/graphics/engine/camera.cpp
+++ b/src/graphics/engine/camera.cpp
@@ -33,6 +33,7 @@
 #include "object/object.h"
 #include "object/object_manager.h"
 #include "object/robotmain.h"
+#include "object/interface/transportable_object.h"
 
 #include "physics/physics.h"
 
@@ -64,7 +65,7 @@ CCamera::CCamera()
 
     m_main    = CRobotMain::GetInstancePointer();
     m_terrain = m_main->GetTerrain();
-    
+
     m_input   = CInput::GetInstancePointer();
 
     m_type      = CAM_TYPE_FREE;
@@ -245,8 +246,8 @@ void CCamera::SetType(CameraType type)
     {
         for (CObject* obj : CObjectManager::GetInstancePointer()->GetAllObjects())
         {
-            if (obj->GetTransporter())
-                continue;  // battery or cargo?
+            if (IsObjectBeingTransported(obj))
+                continue;
 
             SetTransparency(obj, 0.0f);  // opaque object
         }
@@ -890,7 +891,8 @@ bool CCamera::IsCollisionBack(Math::Vector &eye, Math::Vector lookat)
 
     for (CObject* obj : CObjectManager::GetInstancePointer()->GetAllObjects())
     {
-        if (obj->GetTransporter()) continue;  // battery or cargo?
+        if (IsObjectBeingTransported(obj))
+            continue;
 
         SetTransparency(obj, 0.0f);  // opaque object
 
diff --git a/src/graphics/engine/lightning.cpp b/src/graphics/engine/lightning.cpp
index 07042823..71147011 100644
--- a/src/graphics/engine/lightning.cpp
+++ b/src/graphics/engine/lightning.cpp
@@ -33,6 +33,7 @@
 #include "object/object.h"
 #include "object/object_manager.h"
 #include "object/robotmain.h"
+#include "object/interface/transportable_object.h"
 
 #include "object/auto/autopowercaptor.h"
 
@@ -320,7 +321,8 @@ CObject* CLightning::SearchObject(Math::Vector pos)
     for (CObject* obj : CObjectManager::GetInstancePointer()->GetAllObjects())
     {
         if (!obj->GetActive()) continue;  // inactive object?
-        if (obj->GetTransporter() != nullptr) continue;  // object transported?
+
+        if (IsObjectBeingTransported(obj)) continue;
 
         ObjectType type = obj->GetType();
         if ( type == OBJECT_BASE ||
diff --git a/src/graphics/engine/pyro.cpp b/src/graphics/engine/pyro.cpp
index b4d2efa1..8d37358d 100644
--- a/src/graphics/engine/pyro.cpp
+++ b/src/graphics/engine/pyro.cpp
@@ -1374,14 +1374,18 @@ void CPyro::DeleteObject(bool primary, bool secondary)
 
     if (primary)
     {
-        CObject* transporter = m_object->GetTransporter();
-        if ( transporter != nullptr )  // object carries?
+        if (m_object->Implements(ObjectInterfaceType::Transportable))
         {
-            if (transporter->GetPower() == m_object)
-                transporter->SetPower(nullptr);
+            // TODO: this should be handled in the object's destructor
+            CObject* transporter = dynamic_cast<CTransportableObject*>(m_object)->GetTransporter();
+            if (transporter != nullptr)
+            {
+                if (transporter->GetPower() == m_object)
+                    transporter->SetPower(nullptr);
 
-            if (transporter->GetCargo() == m_object)
-                transporter->SetCargo(nullptr);
+                if (transporter->GetCargo() == m_object)
+                    transporter->SetCargo(nullptr);
+            }
         }
 
         CObjectManager::GetInstancePointer()->DeleteObject(m_object);
@@ -2226,7 +2230,7 @@ CObject* CPyro::FallSearchBeeExplo()
              oType != OBJECT_POWER    &&
              oType != OBJECT_ATOMIC   )  continue;
 
-        if ( obj->GetTransporter() != nullptr )  continue;  // object transported?
+        if (IsObjectBeingTransported(obj)) continue;
 
         Math::Vector oPos = obj->GetPosition(0);
 
diff --git a/src/object/auto/autobase.cpp b/src/object/auto/autobase.cpp
index 33c8ed68..90b40aaa 100644
--- a/src/object/auto/autobase.cpp
+++ b/src/object/auto/autobase.cpp
@@ -21,6 +21,7 @@
 #include <stdio.h>
 
 #include "object/auto/autobase.h"
+#include "object/interface/transportable_object.h"
 
 #include "graphics/engine/terrain.h"
 #include "graphics/engine/cloud.h"
@@ -1244,7 +1245,7 @@ void CAutoBase::FreezeCargo(bool freeze)
         obj->SetSpaceshipCargo(false);
 
         if ( obj == m_object )  continue;  // yourself?
-        if ( obj->GetTransporter() != nullptr )  continue;  // transport object?
+        if (IsObjectBeingTransported(obj)) continue;
 
         Math::Vector oPos = obj->GetPosition(0);
         float dist = Math::DistanceProjected(m_pos, oPos);
diff --git a/src/object/auto/autoconvert.cpp b/src/object/auto/autoconvert.cpp
index 82c9ac72..d45ddbbb 100644
--- a/src/object/auto/autoconvert.cpp
+++ b/src/object/auto/autoconvert.cpp
@@ -25,7 +25,7 @@
 #include "object/object_manager.h"
 #include "object/level/parserline.h"
 #include "object/level/parserparam.h"
-
+#include "object/interface/transportable_object.h"
 
 #include "ui/interface.h"
 #include "ui/window.h"
@@ -400,7 +400,7 @@ CObject* CAutoConvert::SearchStone(ObjectType type)
     {
         ObjectType oType = obj->GetType();
         if ( oType != type )  continue;
-        if ( obj->GetTransporter() != nullptr )  continue;
+        if (IsObjectBeingTransported(obj)) continue;
 
         Math::Vector oPos = obj->GetPosition(0);
         float dist = Math::Distance(oPos, cPos);
diff --git a/src/object/auto/autoegg.cpp b/src/object/auto/autoegg.cpp
index 79fbf34c..76fe0e74 100644
--- a/src/object/auto/autoegg.cpp
+++ b/src/object/auto/autoegg.cpp
@@ -26,6 +26,7 @@
 
 #include "object/brain.h"
 #include "object/object_manager.h"
+#include "object/interface/transportable_object.h"
 #include "object/level/parserline.h"
 #include "object/level/parserparam.h"
 
@@ -275,7 +276,7 @@ CObject* CAutoEgg::SearchAlien()
     CObject* best = nullptr;
     for (CObject* obj : CObjectManager::GetInstancePointer()->GetAllObjects())
     {
-        if ( obj->GetTransporter() != nullptr )  continue;
+        if (IsObjectBeingTransported(obj))  continue;
 
         ObjectType type = obj->GetType();
         if ( type != OBJECT_ANT    &&
diff --git a/src/object/auto/autofactory.cpp b/src/object/auto/autofactory.cpp
index c39df28a..507ad8c7 100644
--- a/src/object/auto/autofactory.cpp
+++ b/src/object/auto/autofactory.cpp
@@ -29,6 +29,7 @@
 #include "object/robotmain.h"
 #include "object/level/parserline.h"
 #include "object/level/parserparam.h"
+#include "object/interface/transportable_object.h"
 
 #include "physics/physics.h"
 
@@ -550,7 +551,7 @@ CObject* CAutoFactory::SearchCargo()
     {
         ObjectType type = obj->GetType();
         if ( type != OBJECT_METAL )  continue;
-        if ( obj->GetTransporter() != nullptr )  continue;
+        if (IsObjectBeingTransported(obj))  continue;
 
         Math::Vector oPos = obj->GetPosition(0);
         float dist = Math::Distance(oPos, m_cargoPos);
@@ -674,7 +675,7 @@ CObject* CAutoFactory::SearchVehicle()
 
         ObjectType  type = obj->GetType();
         if ( type != m_type )  continue;
-        if ( obj->GetTransporter() != nullptr )  continue;
+        if (IsObjectBeingTransported(obj))  continue;
 
         Math::Vector oPos = obj->GetPosition(0);
         float dist = Math::Distance(oPos, m_cargoPos);
diff --git a/src/object/auto/autonuclearplant.cpp b/src/object/auto/autonuclearplant.cpp
index a716dfc9..563ec817 100644
--- a/src/object/auto/autonuclearplant.cpp
+++ b/src/object/auto/autonuclearplant.cpp
@@ -25,7 +25,7 @@
 #include "object/object_manager.h"
 #include "object/level/parserline.h"
 #include "object/level/parserparam.h"
-
+#include "object/interface/transportable_object.h"
 
 #include "ui/interface.h"
 #include "ui/window.h"
@@ -387,7 +387,7 @@ void CAutoNuclearPlant::CreatePower()
     float powerLevel = 1.0f;
     CObject* power = CObjectManager::GetInstancePointer()->CreateObject(pos, angle, OBJECT_ATOMIC, powerLevel);
 
-    power->SetTransporter(m_object);
+    dynamic_cast<CTransportableObject*>(power)->SetTransporter(m_object);
     power->SetPosition(0, Math::Vector(22.0f, 3.0f, 0.0f));
     m_object->SetPower(power);
 }
diff --git a/src/object/auto/autopowercaptor.cpp b/src/object/auto/autopowercaptor.cpp
index a9fed670..4326d5e9 100644
--- a/src/object/auto/autopowercaptor.cpp
+++ b/src/object/auto/autopowercaptor.cpp
@@ -26,7 +26,7 @@
 #include "object/object_manager.h"
 #include "object/level/parserline.h"
 #include "object/level/parserparam.h"
-
+#include "object/interface/transportable_object.h"
 
 #include "ui/interface.h"
 #include "ui/window.h"
@@ -250,7 +250,7 @@ void CAutoPowerCaptor::ChargeObject(float rTime)
         float dist = Math::Distance(oPos, sPos);
         if ( dist > 20.0f )  continue;
 
-        if ( obj->GetTransporter() == nullptr && obj->GetType() == OBJECT_POWER )
+        if (! IsObjectBeingTransported(obj) && obj->GetType() == OBJECT_POWER )
         {
             float energy = obj->GetEnergy();
             energy += rTime/2.0f;
diff --git a/src/object/auto/autopowerplant.cpp b/src/object/auto/autopowerplant.cpp
index a42a5ead..9a7404a2 100644
--- a/src/object/auto/autopowerplant.cpp
+++ b/src/object/auto/autopowerplant.cpp
@@ -25,10 +25,10 @@
 #include "math/geometry.h"
 
 #include "object/object_manager.h"
+#include "object/interface/transportable_object.h"
 #include "object/level/parserline.h"
 #include "object/level/parserparam.h"
 
-
 #include "ui/interface.h"
 #include "ui/gauge.h"
 #include "ui/window.h"
@@ -314,11 +314,11 @@ bool CAutoPowerPlant::EventProcess(const Event &event)
             }
 
             cargo = SearchPower();
-            if ( cargo != 0 )
+            if ( cargo != nullptr )
             {
                 cargo->SetZoom(0, 1.0f);
                 cargo->SetLock(false);  // usable battery
-                cargo->SetTransporter(m_object);
+                dynamic_cast<CTransportableObject*>(cargo)->SetTransporter(m_object);
                 cargo->SetPosition(0, Math::Vector(0.0f, 3.0f, 0.0f));
                 m_object->SetPower(cargo);
 
diff --git a/src/object/auto/autovault.cpp b/src/object/auto/autovault.cpp
index f9bdd38c..50b35cd6 100644
--- a/src/object/auto/autovault.cpp
+++ b/src/object/auto/autovault.cpp
@@ -26,7 +26,7 @@
 #include "object/robotmain.h"
 #include "object/level/parserline.h"
 #include "object/level/parserparam.h"
-
+#include "object/interface/transportable_object.h"
 
 #include "ui/interface.h"
 #include "ui/window.h"
@@ -395,7 +395,7 @@ int CAutoVault::CountKeys()
 
     for (CObject* obj : CObjectManager::GetInstancePointer()->GetAllObjects())
     {
-        if ( obj->GetTransporter() != nullptr )  continue;
+        if (IsObjectBeingTransported(obj))  continue;
 
         ObjectType  oType = obj->GetType();
         if ( oType != OBJECT_KEYa &&
@@ -467,7 +467,7 @@ void CAutoVault::LockKeys()
     for (CObject* obj : CObjectManager::GetInstancePointer()->GetAllObjects())
     {
         ObjectType oType = obj->GetType();
-        if ( obj->GetTransporter() != nullptr )  continue;
+        if (IsObjectBeingTransported(obj))  continue;
 
         if ( oType != OBJECT_KEYa &&
              oType != OBJECT_KEYb &&
@@ -491,7 +491,7 @@ void CAutoVault::DownKeys(float progress)
     for (CObject* obj : CObjectManager::GetInstancePointer()->GetAllObjects())
     {
         ObjectType oType = obj->GetType();
-        if ( obj->GetTransporter() != nullptr )  continue;
+        if (IsObjectBeingTransported(obj))  continue;
 
         if ( oType != OBJECT_KEYa &&
              oType != OBJECT_KEYb &&
@@ -520,7 +520,7 @@ void CAutoVault::DeleteKeys()
         for (CObject* obj : CObjectManager::GetInstancePointer()->GetAllObjects())
         {
             ObjectType oType = obj->GetType();
-            if ( obj->GetTransporter() != nullptr )  continue;
+            if (IsObjectBeingTransported(obj))  continue;
 
             if ( oType != OBJECT_KEYa &&
                  oType != OBJECT_KEYb &&
@@ -548,7 +548,7 @@ CObject* CAutoVault::SearchVehicle()
     for (CObject* obj : CObjectManager::GetInstancePointer()->GetAllObjects())
     {
         if ( obj == m_object )  continue;
-        if ( obj->GetTransporter() != nullptr )  continue;
+        if (IsObjectBeingTransported(obj))  continue;
 
         Math::Vector oPos = obj->GetPosition(0);
         float dist = Math::DistanceProjected(oPos, cPos);
diff --git a/src/object/interactive_object.h b/src/object/interface/interactive_object.h
similarity index 100%
rename from src/object/interactive_object.h
rename to src/object/interface/interactive_object.h
diff --git a/src/object/interface/transportable_object.h b/src/object/interface/transportable_object.h
new file mode 100644
index 00000000..9f64b745
--- /dev/null
+++ b/src/object/interface/transportable_object.h
@@ -0,0 +1,55 @@
+/*
+ * This file is part of the Colobot: Gold Edition source code
+ * Copyright (C) 2001-2014, Daniel Roux, EPSITEC SA & TerranovaTeam
+ * http://epsiteс.ch; http://colobot.info; http://github.com/colobot
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see http://gnu.org/licenses
+ */
+
+#pragma once
+
+#include "object/object.h"
+#include "object/object_interface_type.h"
+
+struct Event;
+
+/**
+ * \class CTransportableObject
+ * \brief Interface for transportable objects
+ */
+class CTransportableObject
+{
+public:
+    explicit CTransportableObject(ObjectInterfaceTypes& types)
+    {
+        types[static_cast<int>(ObjectInterfaceType::Transportable)] = true;
+    }
+    virtual ~CTransportableObject()
+    {}
+
+    virtual void SetTransporter(CObject* transporter) = 0;
+    virtual CObject* GetTransporter() = 0;
+    virtual void SetTransporterPart(int part) = 0;
+
+    inline bool IsBeingTransported()
+    {
+        return GetTransporter() != nullptr;
+    }
+};
+
+inline bool IsObjectBeingTransported(CObject* obj)
+{
+    return obj->Implements(ObjectInterfaceType::Transportable) &&
+           dynamic_cast<CTransportableObject*>(obj)->IsBeingTransported();
+}
diff --git a/src/object/motion/motionvehicle.cpp b/src/object/motion/motionvehicle.cpp
index e5f5a600..4d3de6bb 100644
--- a/src/object/motion/motionvehicle.cpp
+++ b/src/object/motion/motionvehicle.cpp
@@ -30,6 +30,7 @@
 
 #include "object/brain.h"
 #include "object/object_manager.h"
+#include "object/interface/transportable_object.h"
 
 #include "physics/physics.h"
 
@@ -939,7 +940,7 @@ void CMotionVehicle::Create(Math::Vector pos, float angle, ObjectType type,
 
         powerCell->SetPosition(0, powerCellPos);
         powerCell->SetAngle(0, Math::Vector(0.0f, powerCellAngle, 0.0f));
-        powerCell->SetTransporter(m_object);
+        dynamic_cast<CTransportableObject*>(powerCell)->SetTransporter(m_object);
         m_object->SetPower(powerCell);
     }
 
diff --git a/src/object/object_interface_type.h b/src/object/object_interface_type.h
index d80a2a42..e0916fe1 100644
--- a/src/object/object_interface_type.h
+++ b/src/object/object_interface_type.h
@@ -33,6 +33,7 @@
 enum class ObjectInterfaceType
 {
     Interactive, //!< interactive objects can process events from event loop
+    Transportable, //!< objects that can be carried by robots or astronaut
     Max //!< maximum value (for getting number of items in enum)
 };
 
diff --git a/src/object/object_manager.cpp b/src/object/object_manager.cpp
index ae7bba19..b290a87b 100644
--- a/src/object/object_manager.cpp
+++ b/src/object/object_manager.cpp
@@ -240,7 +240,7 @@ CObject* CObjectManager::Radar(CObject* pThis, Math::Vector thisPosition, float
         pObj = it->second.get();
         if ( pObj == pThis )  continue; // pThis may be nullptr but it doesn't matter
 
-        if ( pObj->GetTransporter() != 0 )  continue;  // object transported?
+        if (IsObjectBeingTransported(pObj))  continue;
         if ( !pObj->GetActive() )  continue;
         if ( pObj->GetProxyActivate() )  continue;
 
diff --git a/src/object/old_object.cpp b/src/object/old_object.cpp
index 0b1abf3d..a5f5a626 100644
--- a/src/object/old_object.cpp
+++ b/src/object/old_object.cpp
@@ -100,7 +100,16 @@ void uObject(CBotVar* botThis, void* user)
 
     // Updates the position of the object.
     pVar = pVar->GetNext();  // "position"
-    if ( object->GetTransporter() == 0 )
+    if (IsObjectBeingTransported(object))
+    {
+        pSub = pVar->GetItemList();  // "x"
+        pSub->SetInit(CBotVar::InitType::IS_NAN);
+        pSub = pSub->GetNext();  // "y"
+        pSub->SetInit(CBotVar::InitType::IS_NAN);
+        pSub = pSub->GetNext();  // "z"
+        pSub->SetInit(CBotVar::InitType::IS_NAN);
+    }
+    else
     {
         pos = object->GetPosition(0);
         float waterLevel = Gfx::CEngine::GetInstancePointer()->GetWater()->GetLevel();
@@ -112,15 +121,6 @@ void uObject(CBotVar* botThis, void* user)
         pSub = pSub->GetNext();  // "z"
         pSub->SetValFloat(pos.y/g_unit);
     }
-    else    // object transported?
-    {
-        pSub = pVar->GetItemList();  // "x"
-        pSub->SetInit(CBotVar::InitType::IS_NAN);
-        pSub = pSub->GetNext();  // "y"
-        pSub->SetInit(CBotVar::InitType::IS_NAN);
-        pSub = pSub->GetNext();  // "z"
-        pSub->SetInit(CBotVar::InitType::IS_NAN);
-    }
 
     // Updates the angle.
     pos = object->GetAngle(0);
@@ -188,6 +188,7 @@ void uObject(CBotVar* botThis, void* user)
 COldObject::COldObject(int id)
     : CObject(id, OBJECT_NULL)
     , CInteractiveObject(m_implementedInterfaces)
+    , CTransportableObject(m_implementedInterfaces)
 {
     m_sound       = CApplication::GetInstancePointer()->GetSound();
     m_engine      = Gfx::CEngine::GetInstancePointer();
diff --git a/src/object/old_object.h b/src/object/old_object.h
index 1b0b29f0..a3495094 100644
--- a/src/object/old_object.h
+++ b/src/object/old_object.h
@@ -24,9 +24,11 @@
 
 #pragma once
 
-#include "object/interactive_object.h"
 #include "object/object.h"
 
+#include "object/interface/interactive_object.h"
+#include "object/interface/transportable_object.h"
+
 // The father of all parts must always be the part number zero!
 const int OBJECTMAXPART         = 40;
 const int OBJECTMAXDESELLIST    = 10;
@@ -50,7 +52,9 @@ struct ObjectPart
 };
 
 
-class COldObject : public CObject, public CInteractiveObject
+class COldObject : public CObject,
+                   public CInteractiveObject,
+                   public CTransportableObject
 {
     friend class CObjectFactory;
     friend class CObjectManager;
diff --git a/src/object/old_object_interface.h b/src/object/old_object_interface.h
index 9cec3418..96e52c4b 100644
--- a/src/object/old_object_interface.h
+++ b/src/object/old_object_interface.h
@@ -161,9 +161,6 @@ public:
     virtual CObject*    GetPower() = 0;
     virtual void        SetCargo(CObject* cargo) = 0;
     virtual CObject*    GetCargo() = 0;
-    virtual void        SetTransporter(CObject* transporter) = 0;
-    virtual CObject*    GetTransporter() = 0;
-    virtual void        SetTransporterPart(int part) = 0;
 
     virtual void        SetCmdLine(unsigned int rank, float value) = 0;
     virtual float       GetCmdLine(unsigned int rank) = 0;
diff --git a/src/object/robotmain.cpp b/src/object/robotmain.cpp
index 01971670..c82585ef 100644
--- a/src/object/robotmain.cpp
+++ b/src/object/robotmain.cpp
@@ -2004,7 +2004,11 @@ CObject* CRobotMain::DetectObject(Math::Point pos)
     for (CObject* obj : m_objMan->GetAllObjects())
     {
         if (!obj->GetActive()) continue;
-        CObject* transporter = obj->GetTransporter();
+
+        CObject* transporter = nullptr;
+        if (obj->Implements(ObjectInterfaceType::Transportable))
+            transporter = dynamic_cast<CTransportableObject*>(obj)->GetTransporter();
+
         if (transporter != nullptr && !transporter->GetActive()) continue;
         if (obj->GetProxyActivate()) continue;
 
@@ -2121,7 +2125,7 @@ CObject* CRobotMain::DetectObject(Math::Point pos)
         }
         else if (type == OBJECT_POWER || type == OBJECT_ATOMIC)
         {
-            target = obj->GetTransporter();  // battery connected
+            target = dynamic_cast<CTransportableObject*>(obj)->GetTransporter();  // battery connected
             if (!target) target = obj; // standalone battery
         }
 
@@ -2629,7 +2633,7 @@ bool CRobotMain::EventFrame(const Event &event)
             if (pm != nullptr)
                 pm->UpdateObject(obj);
 
-            if (obj->GetTransporter() != nullptr)
+            if (IsObjectBeingTransported(obj))
                 continue;
 
             if (obj->GetType() == OBJECT_TOTO)
@@ -2640,7 +2644,7 @@ bool CRobotMain::EventFrame(const Event &event)
         // Advances all objects transported by robots.
         for (CObject* obj : m_objMan->GetAllObjects())
         {
-            if (obj->GetTransporter() == nullptr)
+            if (! IsObjectBeingTransported(obj))
                 continue;
 
             if (obj->Implements(ObjectInterfaceType::Interactive))
@@ -4176,7 +4180,8 @@ float CRobotMain::SearchNearestObject(Math::Vector center, CObject *exclu)
     for (CObject* obj : m_objMan->GetAllObjects())
     {
         if (!obj->GetActive()) continue;  // inactive?
-        if (obj->GetTransporter() != nullptr) continue;  // object carries?
+        if (IsObjectBeingTransported(obj)) continue;
+
         if (obj == exclu)  continue;
 
         ObjectType type = obj->GetType();
@@ -4324,7 +4329,8 @@ void CRobotMain::ShowDropZone(CObject* metal, CObject* transporter)
     for (CObject* obj : m_objMan->GetAllObjects())
     {
         if (!obj->GetActive()) continue;  // inactive?
-        if (obj->GetTransporter() != nullptr) continue;  // object carried?
+        if (IsObjectBeingTransported(obj)) continue;
+
         if (obj == metal) continue;
         if (obj == transporter) continue;
 
@@ -4524,7 +4530,7 @@ void CRobotMain::CompileScript(bool soluce)
         nbError = 0;
         for (CObject* obj : m_objMan->GetAllObjects())
         {
-            if (obj->GetTransporter() != nullptr) continue;
+            if (IsObjectBeingTransported(obj)) continue;
 
             CBrain* brain = obj->GetBrain();
             if (brain == nullptr) continue;
@@ -4552,7 +4558,7 @@ void CRobotMain::CompileScript(bool soluce)
     {
         for (CObject* obj : m_objMan->GetAllObjects())
         {
-            if (obj->GetTransporter() != 0)  continue;
+            if (IsObjectBeingTransported(obj)) continue;
 
             CBrain* brain = obj->GetBrain();
             if (brain == 0)  continue;
@@ -4568,7 +4574,7 @@ void CRobotMain::CompileScript(bool soluce)
     // Start all programs according to the command "run".
     for (CObject* obj : m_objMan->GetAllObjects())
     {
-        if (obj->GetTransporter() != nullptr) continue;
+        if (IsObjectBeingTransported(obj)) continue;
 
         CBrain* brain = obj->GetBrain();
         if (brain == nullptr)  continue;
@@ -4933,7 +4939,7 @@ bool CRobotMain::IOWriteScene(const char *filename, const char *filecbot, char *
     {
         if (obj->GetType() == OBJECT_TOTO) continue;
         if (obj->GetType() == OBJECT_FIX) continue;
-        if (obj->GetTransporter() != nullptr) continue;
+        if (IsObjectBeingTransported(obj)) continue;
         if (obj->GetBurn()) continue;
         if (obj->GetDead()) continue;
         if (obj->IsExploding()) continue;
@@ -4986,7 +4992,8 @@ bool CRobotMain::IOWriteScene(const char *filename, const char *filecbot, char *
     {
         if (obj->GetType() == OBJECT_TOTO) continue;
         if (obj->GetType() == OBJECT_FIX) continue;
-        if (obj->GetTransporter() != nullptr) continue;
+        if (IsObjectBeingTransported(obj)) continue;
+
         if (obj->GetBurn()) continue;
         if (obj->GetDead()) continue;
 
@@ -5131,7 +5138,7 @@ CObject* CRobotMain::IOReadScene(const char *filename, const char *filecbot)
             if (power != nullptr)
             {
                 obj->SetPower(power);
-                power->SetTransporter(obj);
+                dynamic_cast<CTransportableObject*>(power)->SetTransporter(obj);
             }
 
             cargo  = nullptr;
@@ -5148,7 +5155,7 @@ CObject* CRobotMain::IOReadScene(const char *filename, const char *filecbot)
         nbError = 0;
         for (CObject* obj : m_objMan->GetAllObjects())
         {
-            if (obj->GetTransporter() != nullptr) continue;
+            if (IsObjectBeingTransported(obj)) continue;
 
             objRank = obj->GetDefRank();
             if (objRank == -1) continue;
@@ -5161,7 +5168,7 @@ CObject* CRobotMain::IOReadScene(const char *filename, const char *filecbot)
     // Starts scripts
     for (CObject* obj : m_objMan->GetAllObjects())
     {
-        if (obj->GetTransporter() != nullptr) continue;
+        if (IsObjectBeingTransported(obj)) continue;
         if (obj->GetDefRank() == -1) continue;
 
         CBrain* brain = obj->GetBrain();
@@ -5190,7 +5197,7 @@ CObject* CRobotMain::IOReadScene(const char *filename, const char *filecbot)
                 {
                     if (obj->GetType() == OBJECT_TOTO) continue;
                     if (obj->GetType() == OBJECT_FIX) continue;
-                    if (obj->GetTransporter() != nullptr) continue;
+                    if (IsObjectBeingTransported(obj)) continue;
                     if (obj->GetBurn()) continue;
                     if (obj->GetDead()) continue;
 
diff --git a/src/object/scene_conditions.cpp b/src/object/scene_conditions.cpp
index fcc5c215..59234b34 100644
--- a/src/object/scene_conditions.cpp
+++ b/src/object/scene_conditions.cpp
@@ -25,6 +25,7 @@
 #include "object/level/parserline.h"
 #include "object/object_manager.h"
 #include "object/object.h"
+#include "object/interface/transportable_object.h"
 
 void CSceneCondition::Read(CLevelParserLine* line)
 {
@@ -60,7 +61,7 @@ int CSceneCondition::CountObjects()
 
         if (!this->countTransported)
         {
-            if (obj->GetTransporter() != nullptr) continue;
+            if (IsObjectBeingTransported(obj)) continue;
         }
 
         // TODO: I really hate those fragments that hardcode subcategories into one in random places in code, we should refactor that at some point
@@ -110,10 +111,10 @@ int CSceneCondition::CountObjects()
         }
         if (energyLevel < this->powermin || energyLevel > this->powermax) continue;
 
-        if (obj->GetTransporter() == 0)
-            oPos = obj->GetPosition(0);
+        if (IsObjectBeingTransported(obj))
+            oPos = dynamic_cast<CTransportableObject*>(obj)->GetTransporter()->GetPosition(0);
         else
-            oPos = obj->GetTransporter()->GetPosition(0);
+            oPos = obj->GetPosition(0);
 
         oPos.y = 0.0f;
 
diff --git a/src/object/task/taskbuild.cpp b/src/object/task/taskbuild.cpp
index 91d05d09..99e93a10 100644
--- a/src/object/task/taskbuild.cpp
+++ b/src/object/task/taskbuild.cpp
@@ -32,6 +32,7 @@
 #include "object/motion/motionhuman.h"
 #include "object/object_manager.h"
 #include "object/robotmain.h"
+#include "object/interface/transportable_object.h"
 
 #include "physics/physics.h"
 
@@ -616,7 +617,7 @@ Error CTaskBuild::FlatFloor()
     for (CObject* pObj : CObjectManager::GetInstancePointer()->GetAllObjects())
     {
         if ( !pObj->GetActive() )  continue;  // inactive?
-        if ( pObj->GetTransporter() != 0 )  continue;  // object transported?
+        if (IsObjectBeingTransported(pObj))  continue;
         if ( pObj == m_metal )  continue;
         if ( pObj == m_object )  continue;
 
@@ -663,7 +664,7 @@ Error CTaskBuild::FlatFloor()
     for (CObject* pObj : CObjectManager::GetInstancePointer()->GetAllObjects())
     {
         if ( !pObj->GetActive() )  continue;  // inactive?
-        if ( pObj->GetTransporter() != 0 )  continue;  // object transported?
+        if (IsObjectBeingTransported(pObj))  continue;
         if ( pObj == m_metal )  continue;
         if ( pObj == m_object )  continue;
 
@@ -733,7 +734,7 @@ CObject* CTaskBuild::SearchMetalObject(float &angle, float dMin, float dMax,
     for (CObject* pObj : CObjectManager::GetInstancePointer()->GetAllObjects())
     {
         if ( !pObj->GetActive() )  continue;  // objet inactive?
-        if ( pObj->GetTransporter() != 0 )  continue;  // object transported?
+        if (IsObjectBeingTransported(pObj))  continue;
 
         type = pObj->GetType();
         if ( type != OBJECT_METAL )  continue;
diff --git a/src/object/task/taskgoto.cpp b/src/object/task/taskgoto.cpp
index 03d46a8f..1581342c 100644
--- a/src/object/task/taskgoto.cpp
+++ b/src/object/task/taskgoto.cpp
@@ -30,6 +30,7 @@
 #include "math/geometry.h"
 
 #include "object/object_manager.h"
+#include "object/interface/transportable_object.h"
 
 #include "physics/physics.h"
 
@@ -1148,7 +1149,7 @@ bool CTaskGoto::AdjustBuilding(Math::Vector &pos, float margin, float &distance)
     for (CObject* obj : CObjectManager::GetInstancePointer()->GetAllObjects())
     {
         if ( !obj->GetActive() )  continue;
-        if ( obj->GetTransporter() != nullptr )  continue;  // object transported?
+        if (IsObjectBeingTransported(obj))  continue;
 
         Math::Vector oPos;
         float suppl = 0.0f;
@@ -1305,7 +1306,7 @@ bool CTaskGoto::LeakSearch(Math::Vector &pos, float &delay)
     {
         if ( obj == m_object )  continue;
         if ( !obj->GetActive() )  continue;
-        if ( obj->GetTransporter() != nullptr )  continue;  // object transported?
+        if (IsObjectBeingTransported(obj))  continue;
 
         for (const auto& objCrashSphere : obj->GetAllCrashSpheres())
         {
@@ -1360,7 +1361,7 @@ void CTaskGoto::ComputeRepulse(Math::Point &dir)
         if ( pObj == 0 )  break;
 
         if ( pObj == m_object )  continue;
-        if ( pObj->GetTransporter() != 0 )  continue;
+        if (IsObjectBeingTransported(pObj))  continue;
 
         oPos = pObj->GetPosition(0);
         dist = Math::Distance(oPos, m_goalObject);
@@ -1480,7 +1481,7 @@ void CTaskGoto::ComputeRepulse(Math::Point &dir)
     for (CObject* pObj : CObjectManager::GetInstancePointer()->GetAllObjects())
     {
         if ( pObj == m_object )  continue;
-        if ( pObj->GetTransporter() != 0 )  continue;
+        if (IsObjectBeingTransported(pObj))  continue;
 
         oType = pObj->GetType();
 
@@ -1567,7 +1568,7 @@ void CTaskGoto::ComputeFlyingRepulse(float &dir)
     for (CObject* pObj : CObjectManager::GetInstancePointer()->GetAllObjects())
     {
         if ( pObj == m_object )  continue;
-        if ( pObj->GetTransporter() != nullptr )  continue;
+        if (IsObjectBeingTransported(pObj))  continue;
 
         ObjectType oType = pObj->GetType();
 
@@ -1878,7 +1879,7 @@ void CTaskGoto::BitmapObject()
 
         if ( pObj == m_object )  continue;
         if ( pObj == m_bmCargoObject )  continue;
-        if ( pObj->GetTransporter() != 0 )  continue;
+        if (IsObjectBeingTransported(pObj))  continue;
 
         float h = m_terrain->GetFloorLevel(pObj->GetPosition(0), false);
         if ( m_physics->GetType() == TYPE_FLYING && m_altitude > 0.0f )
diff --git a/src/object/task/taskmanip.cpp b/src/object/task/taskmanip.cpp
index 281064e8..aa9eb200 100644
--- a/src/object/task/taskmanip.cpp
+++ b/src/object/task/taskmanip.cpp
@@ -27,6 +27,7 @@
 
 #include "object/object_manager.h"
 #include "object/robotmain.h"
+#include "object/interface/transportable_object.h"
 
 #include "physics/physics.h"
 
@@ -323,16 +324,17 @@ Error CTaskManip::Start(TaskManipOrder order, TaskManipArm arm)
 
             other = SearchTakeUnderObject(m_targetPos, MARGIN_BEE);
             if ( other == 0 )  return ERR_MANIP_NIL;
+
             m_object->SetCargo(other);  // takes the ball
-            other->SetTransporter(m_object);
-            other->SetTransporterPart(0);  // taken with the base
+            dynamic_cast<CTransportableObject*>(other)->SetTransporter(m_object);
+            dynamic_cast<CTransportableObject*>(other)->SetTransporterPart(0);  // taken with the base
             other->SetPosition(0, Math::Vector(0.0f, -3.0f, 0.0f));
         }
         else
         {
             other = m_object->GetCargo();  // other = ball
             m_object->SetCargo(0);  // lick the ball
-            other->SetTransporter(0);
+            dynamic_cast<CTransportableObject*>(other)->SetTransporter(0);
             pos = m_object->GetPosition(0);
             pos.y -= 3.0f;
             other->SetPosition(0, pos);
@@ -749,7 +751,7 @@ CObject* CTaskManip::SearchTakeUnderObject(Math::Vector &pos, float dLimit)
              type != OBJECT_KEYd    &&
              type != OBJECT_TNT     )  continue;
 
-        if ( pObj->GetTransporter() != 0 )  continue;  // object transported?
+        if (IsObjectBeingTransported(pObj))  continue;
         if ( pObj->GetLock() )  continue;
         if ( pObj->GetZoomY(0) != 1.0f )  continue;
 
@@ -821,7 +823,7 @@ CObject* CTaskManip::SearchTakeFrontObject(bool bAdvance, Math::Vector &pos,
              type != OBJECT_SCRAP4  &&
              type != OBJECT_SCRAP5  )  continue;
 
-        if ( pObj->GetTransporter() != 0 )  continue;  // object transported?
+        if (IsObjectBeingTransported(pObj))  continue;
         if ( pObj->GetLock() )  continue;
         if ( pObj->GetZoomY(0) != 1.0f )  continue;
 
@@ -908,7 +910,7 @@ CObject* CTaskManip::SearchTakeBackObject(bool bAdvance, Math::Vector &pos,
              type != OBJECT_SCRAP4  &&
              type != OBJECT_SCRAP5  )  continue;
 
-        if ( pObj->GetTransporter() != 0 )  continue;  // object transported?
+        if (IsObjectBeingTransported(pObj))  continue;
         if ( pObj->GetLock() )  continue;
         if ( pObj->GetZoomY(0) != 1.0f )  continue;
 
@@ -1096,8 +1098,8 @@ bool CTaskManip::TransporterTakeObject()
         if ( m_object->GetType() == OBJECT_HUMAN ||
              m_object->GetType() == OBJECT_TECH  )
         {
-            cargo->SetTransporter(m_object);
-            cargo->SetTransporterPart(4);  // takes with the hand
+            dynamic_cast<CTransportableObject*>(cargo)->SetTransporter(m_object);
+            dynamic_cast<CTransportableObject*>(cargo)->SetTransporterPart(4);  // takes with the hand
 
             cargo->SetPosition(0, Math::Vector(1.7f, -0.5f, 1.1f));
             cargo->SetAngleY(0, 0.1f);
@@ -1106,8 +1108,8 @@ bool CTaskManip::TransporterTakeObject()
         }
         else if ( m_bSubm )
         {
-            cargo->SetTransporter(m_object);
-            cargo->SetTransporterPart(2);  // takes with the right claw
+            dynamic_cast<CTransportableObject*>(cargo)->SetTransporter(m_object);
+            dynamic_cast<CTransportableObject*>(cargo)->SetTransporterPart(2);  // takes with the right claw
 
             pos = Math::Vector(1.1f, -1.0f, 1.0f);  // relative
             cargo->SetPosition(0, pos);
@@ -1117,8 +1119,8 @@ bool CTaskManip::TransporterTakeObject()
         }
         else
         {
-            cargo->SetTransporter(m_object);
-            cargo->SetTransporterPart(3);  // takes with the hand
+            dynamic_cast<CTransportableObject*>(cargo)->SetTransporter(m_object);
+            dynamic_cast<CTransportableObject*>(cargo)->SetTransporterPart(3);  // takes with the hand
 
             pos = Math::Vector(4.7f, 0.0f, 0.0f);  // relative to the hand (lem4)
             cargo->SetPosition(0, pos);
@@ -1138,8 +1140,8 @@ bool CTaskManip::TransporterTakeObject()
 
         if ( m_bSubm )
         {
-            cargo->SetTransporter(m_object);
-            cargo->SetTransporterPart(2);  // takes with the right claw
+            dynamic_cast<CTransportableObject*>(cargo)->SetTransporter(m_object);
+            dynamic_cast<CTransportableObject*>(cargo)->SetTransporterPart(2);  // takes with the right claw
 
             pos = Math::Vector(1.1f, -1.0f, 1.0f);  // relative
             cargo->SetPosition(0, pos);
@@ -1149,8 +1151,8 @@ bool CTaskManip::TransporterTakeObject()
         }
         else
         {
-            cargo->SetTransporter(m_object);
-            cargo->SetTransporterPart(3);  // takes with the hand
+            dynamic_cast<CTransportableObject*>(cargo)->SetTransporter(m_object);
+            dynamic_cast<CTransportableObject*>(cargo)->SetTransporterPart(3);  // takes with the hand
 
             pos = Math::Vector(4.7f, 0.0f, 0.0f);  // relative to the hand (lem4)
             cargo->SetPosition(0, pos);
@@ -1168,8 +1170,8 @@ bool CTaskManip::TransporterTakeObject()
         if ( cargo == 0 )  return false;  // nothing to take?
         m_cargoType = cargo->GetType();
 
-        cargo->SetTransporter(m_object);
-        cargo->SetTransporterPart(3);  // takes with the hand
+        dynamic_cast<CTransportableObject*>(cargo)->SetTransporter(m_object);
+        dynamic_cast<CTransportableObject*>(cargo)->SetTransporterPart(3);  // takes with the hand
 
         pos = Math::Vector(4.7f, 0.0f, 0.0f);  // relative to the hand (lem4)
         cargo->SetPosition(0, pos);
@@ -1191,7 +1193,7 @@ bool CTaskManip::TransporterTakeObject()
         cargo->SetAngleX(0, 0.0f);
         cargo->SetAngleZ(0, Math::PI/2.0f);
         cargo->SetAngleY(0, 0.0f);
-        cargo->SetTransporterPart(3);  // takes with the hand
+        dynamic_cast<CTransportableObject*>(cargo)->SetTransporterPart(3);  // takes with the hand
 
         m_object->SetPower(0);
         m_object->SetCargo(cargo);  // takes
@@ -1207,8 +1209,8 @@ bool CTaskManip::TransporterTakeObject()
         m_cargoType = cargo->GetType();
 
         other->SetPower(0);
-        cargo->SetTransporter(m_object);
-        cargo->SetTransporterPart(3);  // takes with the hand
+        dynamic_cast<CTransportableObject*>(cargo)->SetTransporter(m_object);
+        dynamic_cast<CTransportableObject*>(cargo)->SetTransporterPart(3);  // takes with the hand
 
         pos = Math::Vector(4.7f, 0.0f, 0.0f);  // relative to the hand (lem4)
         cargo->SetPosition(0, pos);
@@ -1248,7 +1250,7 @@ bool CTaskManip::TransporterDeposeObject()
         cargo->SetAngleZ(0, 0.0f);
         cargo->FloorAdjust();  // plate well on the ground
 
-        cargo->SetTransporter(0);
+        dynamic_cast<CTransportableObject*>(cargo)->SetTransporter(0);
         m_object->SetCargo(0);  // deposit
     }
 
@@ -1266,7 +1268,7 @@ bool CTaskManip::TransporterDeposeObject()
         cargo->SetAngleX(0, 0.0f);
         cargo->SetAngleZ(0, 0.0f);
 
-        cargo->SetTransporter(0);
+        dynamic_cast<CTransportableObject*>(cargo)->SetTransporter(0);
         m_object->SetCargo(0);  // deposit
     }
 
@@ -1278,8 +1280,8 @@ bool CTaskManip::TransporterDeposeObject()
 
         if ( m_object->GetPower() != 0 )  return false;
 
-        cargo->SetTransporter(m_object);
-        cargo->SetTransporterPart(0);  // carried by the base
+        dynamic_cast<CTransportableObject*>(cargo)->SetTransporter(m_object);
+        dynamic_cast<CTransportableObject*>(cargo)->SetTransporterPart(0);  // carried by the base
 
         character = m_object->GetCharacter();
         cargo->SetPosition(0, character->posPower);
@@ -1304,14 +1306,14 @@ bool CTaskManip::TransporterDeposeObject()
         m_cargoType = cargo->GetType();
 
         other->SetPower(cargo);
-        cargo->SetTransporter(other);
+        dynamic_cast<CTransportableObject*>(cargo)->SetTransporter(other);
 
         character = other->GetCharacter();
         cargo->SetPosition(0, character->posPower);
         cargo->SetAngleY(0, 0.0f);
         cargo->SetAngleX(0, 0.0f);
         cargo->SetAngleZ(0, 0.0f);
-        cargo->SetTransporterPart(0);  // carried by the base
+        dynamic_cast<CTransportableObject*>(cargo)->SetTransporterPart(0);  // carried by the base
 
         m_object->SetCargo(0);  // deposit
     }
@@ -1330,7 +1332,7 @@ bool CTaskManip::IsFreeDeposeObject(Math::Vector pos)
     {
         if ( obj == m_object )  continue;
         if ( !obj->GetActive() )  continue;  // inactive?
-        if ( obj->GetTransporter() != nullptr )  continue;  // object transported?
+        if (IsObjectBeingTransported(obj))  continue;
 
         for (const auto& crashSphere : obj->GetAllCrashSpheres())
         {
diff --git a/src/object/task/taskreset.cpp b/src/object/task/taskreset.cpp
index 67860969..546b75d7 100644
--- a/src/object/task/taskreset.cpp
+++ b/src/object/task/taskreset.cpp
@@ -23,6 +23,7 @@
 #include "object/brain.h"
 #include "object/object_manager.h"
 #include "object/robotmain.h"
+#include "object/interface/transportable_object.h"
 
 
 
@@ -167,9 +168,9 @@ Error CTaskReset::Start(Math::Vector goal, Math::Vector angle)
     int     i;
 
     cargo = m_object->GetCargo();
-    if ( cargo != 0 && cargo->GetResetCap() == RESET_MOVE )
+    if ( cargo != nullptr && cargo->GetResetCap() == RESET_MOVE )
     {
-        cargo->SetTransporter(0);
+        dynamic_cast<CTransportableObject*>(cargo)->SetTransporter(0);
         m_object->SetCargo(0);  // does nothing
     }
 
diff --git a/src/object/task/tasktake.cpp b/src/object/task/tasktake.cpp
index 6efa666b..0acfaa06 100644
--- a/src/object/task/tasktake.cpp
+++ b/src/object/task/tasktake.cpp
@@ -28,6 +28,7 @@
 #include "object/motion/motionhuman.h"
 #include "object/object_manager.h"
 #include "object/robotmain.h"
+#include "object/interface/transportable_object.h"
 
 #include "physics/physics.h"
 
@@ -329,7 +330,7 @@ CObject* CTaskTake::SearchTakeObject(float &angle,
              type != OBJECT_KEYd    &&
              type != OBJECT_TNT     )  continue;
 
-        if ( pObj->GetTransporter() != 0 )  continue;  // object transported?
+        if (IsObjectBeingTransported(pObj))  continue;
         if ( pObj->GetLock() )  continue;
         if ( pObj->GetZoomY(0) != 1.0f )  continue;
 
@@ -460,8 +461,8 @@ bool CTaskTake::TransporterTakeObject()
         if ( cargo == 0 )  return false;  // rien � prendre ?
         m_cargoType = cargo->GetType();
 
-        cargo->SetTransporter(m_object);
-        cargo->SetTransporterPart(4);  // takes with the hand
+        dynamic_cast<CTransportableObject*>(cargo)->SetTransporter(m_object);
+        dynamic_cast<CTransportableObject*>(cargo)->SetTransporterPart(4);  // takes with the hand
 
 //?     cargo->SetPosition(0, Math::Vector(2.2f, -1.0f, 1.1f));
         cargo->SetPosition(0, Math::Vector(1.7f, -0.5f, 1.1f));
@@ -482,8 +483,8 @@ bool CTaskTake::TransporterTakeObject()
         m_cargoType = cargo->GetType();
 
         other->SetPower(0);
-        cargo->SetTransporter(m_object);
-        cargo->SetTransporterPart(4);  // takes with the hand
+        dynamic_cast<CTransportableObject*>(cargo)->SetTransporter(m_object);
+        dynamic_cast<CTransportableObject*>(cargo)->SetTransporterPart(4);  // takes with the hand
 
 //?     cargo->SetPosition(0, Math::Vector(2.2f, -1.0f, 1.1f));
         cargo->SetPosition(0, Math::Vector(1.7f, -0.5f, 1.1f));
@@ -523,7 +524,7 @@ bool CTaskTake::TransporterDeposeObject()
         cargo->SetAngleZ(0, 0.0f);
         cargo->FloorAdjust();  // plate well on the ground
 
-        cargo->SetTransporter(0);
+        dynamic_cast<CTransportableObject*>(cargo)->SetTransporter(0);
         m_object->SetCargo(0);  // deposit
     }
 
@@ -540,14 +541,14 @@ bool CTaskTake::TransporterDeposeObject()
         m_cargoType = cargo->GetType();
 
         other->SetPower(cargo);
-        cargo->SetTransporter(other);
+        dynamic_cast<CTransportableObject*>(cargo)->SetTransporter(other);
 
         character = other->GetCharacter();
         cargo->SetPosition(0, character->posPower);
         cargo->SetAngleY(0, 0.0f);
         cargo->SetAngleX(0, 0.0f);
         cargo->SetAngleZ(0, 0.0f);
-        cargo->SetTransporterPart(0);  // carried by the base
+        dynamic_cast<CTransportableObject*>(cargo)->SetTransporterPart(0);  // carried by the base
 
         m_object->SetCargo(0);  // deposit
     }
@@ -566,7 +567,7 @@ bool CTaskTake::IsFreeDeposeObject(Math::Vector pos)
     {
         if ( pObj == m_object )  continue;
         if ( !pObj->GetActive() )  continue;  // inactive?
-        if ( pObj->GetTransporter() != 0 )  continue;  // object transported?
+        if (IsObjectBeingTransported(pObj))  continue;
 
         for (const auto& crashSphere : pObj->GetAllCrashSpheres())
         {
diff --git a/src/physics/physics.cpp b/src/physics/physics.cpp
index 63e71986..11baf23a 100644
--- a/src/physics/physics.cpp
+++ b/src/physics/physics.cpp
@@ -43,6 +43,7 @@
 #include "object/task/task.h"
 #include "object/level/parserline.h"
 #include "object/level/parserparam.h"
+#include "object/interface/transportable_object.h"
 
 
 #include <cstring>
@@ -1779,7 +1780,7 @@ void CPhysics::WaterFrame(float aTime, float rTime)
 
     level = m_water->GetLevel();
     if ( level == 0.0f )  return;  // no water?
-    if ( m_object->GetTransporter() != 0 )  return;  // object transported?
+    if (IsObjectBeingTransported(m_object))  return;
 
     // Management of flames into the lava.
     pos = m_object->GetPosition(0);
@@ -2530,7 +2531,7 @@ int CPhysics::ObjectAdapt(const Math::Vector &pos, const Math::Vector &angle)
     for (CObject* pObj : CObjectManager::GetInstancePointer()->GetAllObjects())
     {
         if ( pObj == m_object )  continue;  // yourself?
-        if ( pObj->GetTransporter() != 0 )  continue;  // object transported?
+        if (IsObjectBeingTransported(pObj))  continue;
         if ( !pObj->GetEnable() )  continue;  // inactive?
         if ( pObj->GetRuin() )  continue;  // is burning or exploding?
         if ( pObj->GetDead() )  continue;  // dead man?
diff --git a/src/ui/map.cpp b/src/ui/map.cpp
index 3d437945..56d4283f 100644
--- a/src/ui/map.cpp
+++ b/src/ui/map.cpp
@@ -22,6 +22,8 @@
 
 #include "common/image.h"
 
+#include "object/interface/transportable_object.h"
+
 #include <string.h>
 
 
@@ -1145,7 +1147,7 @@ void CMap::UpdateObject(CObject* pObj)
     if ( !pObj->GetActive() )  return;
     if ( !pObj->GetSelectable() )  return;
     if ( pObj->GetProxyActivate() )  return;
-    if ( pObj->GetTransporter() != 0 )  return;
+    if (IsObjectBeingTransported(pObj))  return;
 
     type = pObj->GetType();
     pos  = pObj->GetPosition(0);
diff --git a/src/ui/target.cpp b/src/ui/target.cpp
index 642fcd64..5c433b35 100644
--- a/src/ui/target.cpp
+++ b/src/ui/target.cpp
@@ -246,9 +246,9 @@ CObject* CTarget::DetectFriendObject(Math::Point pos)
         }
         else if ( (type == OBJECT_POWER  ||
                   type == OBJECT_ATOMIC ) &&
-             obj->GetTransporter() != nullptr )  // battery used?
+             IsObjectBeingTransported(obj) )  // battery used?
         {
-            target = obj->GetTransporter();
+            target = dynamic_cast<CTransportableObject*>(obj)->GetTransporter();
             if ( target->GetType() == OBJECT_MOBILEtg )
             {
                 target = nullptr;