Union Pacific 3900 Series 4-6-6-4 Challenger drawings, engine only:

Union Pacific 3900 Series 4-6-6-4 Challenger drawings, engine only:

We offer reproductions of the original Union Pacific design and engineering drawings used to build full-size engines during the grand steam locomotive era.

Union Pacific Railroad contracted with the American Locomotive Company (ALCO) for construction of the 4-6-6-4 Challenger, the 4-8-8-4 Big Boy, and the FEF-3 4-8-4 Northern. We offer sets and individual drawings of those locomotives