Märklin’s 5-gauge toy trains were the largest the firm ever created. Produced by special order only, many examples were commissioned by department stores in the United States and Great Britain seeking a spectacular window attraction to lure customers. Powered by a working steam boiler, the locomotive’s fuel reservoir holds up to a liter of kerosene, which was more than enough to power it for a few hours of operation. Nothing is known of this impressive toy’s history prior to its discovery in a Pennsylvania barn in the 1990s.