UP Big Boy 4006 - National Museum of Transportation
UP Big Boy X4006 - Kirkwood, MO While I have not managed to see Union Pacific Big Boy 4014, the newly restored and running Big Boy steam locomotive, I have managed to see and photograph two other Big Boy locomotives on static display. One of the two is Union Pacific Big Boy 4006, which is on display at the National Museum of Transportation in Kirkwood, Missouri. Kirkwood, is a suburb of St. Louis, Missouri. Front of UP Big Boy X4006 - Kirkwood, MO About Union Pacific Big Boy 4006 Union Pacific 4006 was built by the American Locomotive Company (Alco) in September 1941. In total, Alco built twenty-five Big Boys for the Union Pacific Railroad, with the first ones being delivered in 1941. The locomotives have a wheel arrangement of 4-8-8-4, and are articulated type steam locomotives. This means that the two sets of eight driving wheels move separately from each other, allowing the steam locomotives to navigate tighter radius curves. Overall, the locomotives and thei...