Thank you for viewing! This is a motor unit with chassis for Plarail. It is the type that is inserted from the bottom, which was used in some vehicles. It supports size D batteries. Operation has been confirmed, and it climbed the slope rails without any problems. The rubber tires have been replaced with new ones. There is no rust on the internal terminals. Please understand that this is a used item and purchase it with the understanding that it is non-refundable and non-returnable.