Union Pacific Railway Engine No. 737 or UP 737 is a 4-4-0 steam locomotive. It is currently the oldest preserved Union Pacific steam locomotive. It was originally acquired by the Union Pacific Railroad in 1887. It is one of about 115 surviving American 4-4-0s in the United States(around 30 4-4-0s if reproductions are not counted) of which about 60 are operational.
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