Double diesel By Angela Cotey | October 7, 2024 | Last updated on August 7, 2025 Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates Union Pacific U50C No. 5000 lays over at the railroad’s North Platte, Neb., shop on Jan. 21, 1975. It was one of 40 such units on the railroad in operation from 1969 to 1978. Bruce Barrett photo