The only U25C preserved is Lake Superior and Ishpeming #2501 displayed in Marquette, Michigan.
References
Marre, Louis A. (1995). Diesel Locomotives: The First 50 Years: A Guide to Diesels Built Before 1972. Railroad Reference Series. Waukesha, Wisconsin: Kalmbach Publishing. ISBN978-0-89024-258-2.[page needed]
"General Electric U25C" by Diesel Era Staff from Diesel Era Volume 4 Number 1 January/February 1993, pages 34-53.