The Union Pacific 51 was a gas turbine locomotive used from the 50s until the end 60s. It was intended to replace the Big Boy steam locomotives. At the time it was one of the most powerful locomotives equipped with internal combustion engine.The model is a TT scale (1:120) replica of the original. The files are ready-to-print with resin DLP/SLA printers, recommended layer height: 25 microns. The decal files are also included in CorelDraw format (send a message for different format). For a running model you will need a Tillig BR218 locomotive, Peho axle bushings, 7.7 mm wheels, and a coupler of your choosing (e.g. Tillig)