Locomotive Wiki


The Union Pacific Railroad Class P-1 was a designation used for a group of 4-6-2 "Pacific" type steam locomotives. These locomotives were primarily intended for express passenger service.

History[]

Union Pacific's Class P-1 steam locomotives were powerful, articulated (triplex) engines designed for heavy-duty helper service, primarily on steep grades, but were complex, slow, and ultimately considered unsuccessful, leading UP to build the simpler, more effective 4-8-8-4 Big Boy instead, with UP's P-1s representing early efforts in massive freight power before dieselization.

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Preserved Union Pacific Locomotives
UP Class 700 No. 737
UP Class C-2 No. 237No. 264No. 561No. 616No. 618No. 6051No. 6237
UP Class C-57 No. 407No. 421No. 428No. 437No. 460No. 477No. 480No. 481No. 485
UP Class MK-1 No. 2005
UP Class MK-7 No. 2537
UP Class MK-9 No. 2295
UP Class MK-10 No. 2564
UP Class T-57 No. 1242No. 1243
UP Class P-1 No. 3206
UP Class P-2 No. 3203
UP Class TTT-6 No. 5511
UP Class S-4 No. 4420
UP Class S-5 No. 4436No. 4439No. 4442
UP Class S-6 No. 4455No. 4466
UP Class FEF-1 No. 814
UP Class FEF-2 No. 833
UP Class FEF-3 No. 838No. 844
UP Class 9000 No. 9000
UP Heavy Challengers No. 3977No. 3985
UP Big Boys No. 4004No. 4005No. 4006No. 4012No. 4014No. 4017No. 4018No. 4023