The Rapido Trains HO Scale Steam Heater Car, known in Canada as Steam Generator Units or SGUs, were introduced in the diesel era to provide steam heat to passenger trains in cooler weather. Heater cars were frequently rebuilt from boxcars, B-units and old steam locomotive tenders, so they varied in shape and size from railroad to railroad. That is, unless you are in Canada. It is so cold there so much of the time that purpose-built SGUs were built by CC&F (Canadian Car & Foundry), GMD (General Motors Diesel Division) and NSC (National Steel Car). This model is based on the GMD prototype. Decorated in a variety of popular passenger schemes, this car is great for use on your cold weather trains. Check out the entire line of Rapido HO Scale passenger cars. Full underbody detail Sound decoder fro use on DCC and DC layouts Factory-installed grab irons and detailing Correct trucks with metal wheelsets Working backup lights, controlled by magnetic wand Metal magnetic knuckle couplers