The Union Pacific Diesels are diesels that originated from the Union Pacific Railroad on the Mainland.

UP 4780

Union Pacific EMD SD70M 4780 is one diesel that appear in many episodes, such as Tillie to the Rescue! and Diesel's Steel Gang. 4780 can be sometimes seen hauling sodor freight or just wandering around. 4780 is a somewhat yellow standard gauge diesel with red numbers on the cab and a red 'UNION PACIFIC' on the side.


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