General Electric U25C Builder List and Phase Guide
General Electric created the U25C for a single customer in 1963, the Oroville Dam Constructors. They added the trucks used on the EL-C and E-44 electric units to their successful U25B and created a niche market that served the Burlington, Northern Pacific, Pennsylvania Railroad, Louisville & Nashville, and Atlantic Coast Line. Although it was only in production from 1963 to 1965, there were four distinct phases. Here is a builder's list and phase guide. (Revised February 17, 2022, at 18:08 MST)