MTH Railking 30-1843-1 O Gauge 4-8-8-4 Imperial Big Boy Steam Loco UP 4018 with PS3 Covered Hopper 6:1 ratio gearbox with heavy-duty

6:1 ratio gearbox with heavy-duty sealed gear differential and externally adjustable slipper clutch

Easy-access motor and battery

Athearn Genesis G82712 HO Scale EMD GP7 Conrail CR 5839 DCC & Sound

Traxxas 3370 Velineon VXL-3M Brushless Power System 1/16 Scale

MTH Railking 30-1843-1 O Gauge 4-8-8-4 Imperial Big Boy Steam Loco UP 4018 with PS3 Covered Hopper 6:1 ratio gearbox with heavy-dutyMTH Railking 30 1843 1 O Gauge 4 8 8 4 Imperial Big Boy Steam Loco UP 4018 with PS3 Just months before Pearl Harbor, the American Locomotive Company delivered the first Big Boy to the Union Pacific Railroad. The UP's Department of Research and Mechanical Standards had designed the locomotive for a specific task: to pull a 3600 ton train unassisted over the Wasatch Mountains in Utah. While the Big Boy is often cited as the biggest steam locomotive ever