After building two huge 1/16 Diesel locomotives, one of which we blogged in February, Dennis Glaasker (Bricksonwheels) has turned his attention to something rather more old-school: a Union Pacific 1941 `Big Boy’ steam engine.
Its scale is 1/38, based on LEGO’s track gauge. This is relatively small by Dennis’ standards, but the model is still more than 1 m long and took two and half months to build. The engine can run, albeit not on standard radius curves, and to get it to run, Dennis chose to include several custom and aftermarket parts. The wheels and the valve gear and side rods were 3D printed by Jaap Kroon (JaapTechnic). The model is driven by three (!) Power Functions XL motors, controlled through an SBrick and powered by a rechargeable RC battery pack. To top it all off, this behemoth is equipped with lights and electronics supplied by Brickstuff. Purists may be horrified by this cornucopia of high-tech non-LEGO parts, but I think it’s hard to deny that the end result is impressive.