There were only 23 GP40X's built. Union Pacific purchased six of them. These came with the HTB truck which were supposed to improve traction. These locomotives offered 3500 horsepower and were bas... (more)

A very dirty 9002 leads three C&NW GP50s - including Class Engine 5050 - with an eastbound train.

GP40X 9002 waits in a January snow storm, just north of the Denver Union Terminal, for the westbound California Zephyr which it will pilot from Denver through Wyoming. The train came in led by BN ... (more)