diff --git a/src/economy.cpp b/src/economy.cpp
index 562f9e2b17..0006c564f6 100644
--- a/src/economy.cpp
+++ b/src/economy.cpp
@@ -369,7 +369,7 @@ void ChangeOwnershipOfCompanyItems(Owner old_owner, Owner new_owner)
 				} else {
 					v->owner = new_owner;
 					v->colourmap = PAL_NONE;
-					if (IsEngineCountable(v)) Company::Get(new_owner)->num_engines[v->engine_type]++;
+					if (v->IsEngineCountable()) Company::Get(new_owner)->num_engines[v->engine_type]++;
 					if (v->IsPrimaryVehicle()) v->unitnumber = unitidgen[v->type].NextID();
 				}
 			}
diff --git a/src/engine.cpp b/src/engine.cpp
index 030b3ca8a7..814f14e409 100644
--- a/src/engine.cpp
+++ b/src/engine.cpp
@@ -386,7 +386,7 @@ void SetCachedEngineCounts()
 
 	const Vehicle *v;
 	FOR_ALL_VEHICLES(v) {
-		if (!IsEngineCountable(v)) continue;
+		if (!v->IsEngineCountable()) continue;
 
 		assert(v->engine_type < engines);
 
diff --git a/src/group_cmd.cpp b/src/group_cmd.cpp
index bd4905268a..7ef41258b9 100644
--- a/src/group_cmd.cpp
+++ b/src/group_cmd.cpp
@@ -215,7 +215,7 @@ CommandCost CmdAddVehicleGroup(TileIndex tile, DoCommandFlag flags, uint32 p1, u
 			case VEH_ROAD:
 			case VEH_SHIP:
 			case VEH_AIRCRAFT:
-				if (IsEngineCountable(v)) UpdateNumEngineGroup(v->engine_type, v->group_id, new_g);
+				if (v->IsEngineCountable()) UpdateNumEngineGroup(v->engine_type, v->group_id, new_g);
 				v->group_id = new_g;
 				break;
 		}
@@ -349,7 +349,7 @@ void SetTrainGroupID(Train *v, GroupID new_g)
 	assert(v->IsFrontEngine());
 
 	for (Vehicle *u = v; u != NULL; u = u->Next()) {
-		if (IsEngineCountable(u)) UpdateNumEngineGroup(u->engine_type, u->group_id, new_g);
+		if (u->IsEngineCountable()) UpdateNumEngineGroup(u->engine_type, u->group_id, new_g);
 
 		u->group_id = new_g;
 	}
@@ -372,7 +372,7 @@ void UpdateTrainGroupID(Train *v)
 
 	GroupID new_g = v->IsFrontEngine() ? v->group_id : (GroupID)DEFAULT_GROUP;
 	for (Vehicle *u = v; u != NULL; u = u->Next()) {
-		if (IsEngineCountable(u)) UpdateNumEngineGroup(u->engine_type, u->group_id, new_g);
+		if (u->IsEngineCountable()) UpdateNumEngineGroup(u->engine_type, u->group_id, new_g);
 
 		u->group_id = new_g;
 	}
diff --git a/src/vehicle.cpp b/src/vehicle.cpp
index bed1d0fcc7..df1059391b 100644
--- a/src/vehicle.cpp
+++ b/src/vehicle.cpp
@@ -473,17 +473,16 @@ uint CountVehiclesInChain(const Vehicle *v)
 }
 
 /** Check if a vehicle is counted in num_engines in each company struct
- * @param *v Vehicle to test
  * @return true if the vehicle is counted in num_engines
  */
-bool IsEngineCountable(const Vehicle *v)
+bool Vehicle::IsEngineCountable() const
 {
-	switch (v->type) {
-		case VEH_AIRCRAFT: return IsNormalAircraft(v); // don't count plane shadows and helicopter rotors
+	switch (this->type) {
+		case VEH_AIRCRAFT: return IsNormalAircraft(this); // don't count plane shadows and helicopter rotors
 		case VEH_TRAIN:
-			return !Train::From(v)->IsArticulatedPart() && // tenders and other articulated parts
-					!Train::From(v)->IsRearDualheaded(); // rear parts of multiheaded engines
-		case VEH_ROAD: return RoadVehicle::From(v)->IsRoadVehFront();
+			return !Train::From(this)->IsArticulatedPart() && // tenders and other articulated parts
+					!Train::From(this)->IsRearDualheaded(); // rear parts of multiheaded engines
+		case VEH_ROAD: return RoadVehicle::From(this)->IsRoadVehFront();
 		case VEH_SHIP: return true;
 		default: return false; // Only count company buildable vehicles
 	}
@@ -501,7 +500,7 @@ void Vehicle::PreDestructor()
 		delete this->cargo_payment;
 	}
 
-	if (IsEngineCountable(this)) {
+	if (this->IsEngineCountable()) {
 		Company::Get(this->owner)->num_engines[this->engine_type]--;
 		if (this->owner == _local_company) InvalidateAutoreplaceWindow(this->engine_type, this->group_id);
 
diff --git a/src/vehicle_base.h b/src/vehicle_base.h
index 8cb9e77617..ff8c340009 100644
--- a/src/vehicle_base.h
+++ b/src/vehicle_base.h
@@ -511,6 +511,8 @@ public:
 	{
 		return (this->orders.list == NULL) ? NULL : this->orders.list->GetLastOrder();
 	}
+
+	bool IsEngineCountable() const;
 };
 
 #define FOR_ALL_VEHICLES_FROM(var, start) FOR_ALL_ITEMS_FROM(Vehicle, vehicle_index, var, start)
diff --git a/src/vehicle_func.h b/src/vehicle_func.h
index fa3fbc1b90..5d12ba9ca7 100644
--- a/src/vehicle_func.h
+++ b/src/vehicle_func.h
@@ -26,7 +26,6 @@ void VehicleServiceInDepot(Vehicle *v);
 Vehicle *GetLastVehicleInChain(Vehicle *v);
 const Vehicle *GetLastVehicleInChain(const Vehicle *v);
 uint CountVehiclesInChain(const Vehicle *v);
-bool IsEngineCountable(const Vehicle *v);
 void FindVehicleOnPos(TileIndex tile, void *data, VehicleFromPosProc *proc);
 void FindVehicleOnPosXY(int x, int y, void *data, VehicleFromPosProc *proc);
 bool HasVehicleOnPos(TileIndex tile, void *data, VehicleFromPosProc *proc);