407 /** Get the default cargo type for a certain engine type

   408  * @param engine The ID to get the cargo for

   409  * @return The cargo type. CT_INVALID means no cargo capacity

   410  */

   411 CargoID GetEngineCargoType(EngineID engine)

   412 {

   413 	assert(IsEngineIndex(engine));

   414 

   415 	switch (GetEngine(engine)->type) {

   416 		case VEH_TRAIN:

   417 			if (RailVehInfo(engine)->capacity == 0) return CT_INVALID;

   418 			return RailVehInfo(engine)->cargo_type;

   419 

   420 		case VEH_ROAD:

   421 			if (RoadVehInfo(engine)->capacity == 0) return CT_INVALID;

   422 			return RoadVehInfo(engine)->cargo_type;

   423 

   424 		case VEH_SHIP:

   425 			if (ShipVehInfo(engine)->capacity == 0) return CT_INVALID;

   426 			return ShipVehInfo(engine)->cargo_type;

   427 

   428 		case VEH_AIRCRAFT:

   429 			/* all aircraft starts as passenger planes with cargo capacity */

   430 			return CT_PASSENGERS;

   431 

   432 		default: NOT_REACHED(); return CT_INVALID;

   433 	}

   434 }

   435