The crane car has a superstructure that can be rotated, a movable boom, and a hand crane for the crane line. The crane tender car has a boom support. The container transport car is loaded with a 40 ft. container. The container can be removed and can be opened for loading. All of the cars have Relex couplers. The set is a great add-on to the Container Train starter set #441-29452, sold separately.