Prototype: Prototype: The advantage of the piggy back technique is in the fast turnaround time of the combination street/train. Our piggy back model is taken from the European standard pocket wagon. This wagon is loaded from above and is suited for the transportation of semi-trailers that can be moved with a crane as well as for swap containers. It was ordered in large quantities from various railway organizations. In most cases the block trains will be comprised of a large number of these wagons, which in many cases stand out from the usual mass of freight trains because of the differently coloured semi-trailers. Model: Loaded with semi-trailer "NOR-CARGO". Now with close couplers!