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The Pennsylvania Railroad (PRR) class T1 duplex-drive 4-4-4-4 steam locomotives, introduced in 1942 with two prototypes and later in 1945-1946 with 50 production examples, were the last steam locomotives built for the PRR and arguably its most controversial.
Pennsylvania Railroad 5550 (PRR 5550) is a mainline duplex drive steam locomotive under construction in the United States. With an estimated completion by 2030, the locomotive will become the 53rd example of the Pennsylvania Railroad's T1 steam locomotive class and the only operational locomotive of its type, [7] as well as the largest steam locomotive built in the United States since 1952.
The PRR also desired to apply the duplex principle to freight haulage, and the Q1 was the first experiment in that direction. It was a 4-6-4-4 fast freight locomotive, delivered in May 1942. Like the B&O's George H. Emerson it had the second pair of cylinders facing backwards, and all were fitted with standard Walschaerts valve gear.
Nine T-1's (Nos. 2107, 2111-2115, 2119, and 2128) were leased to the Pennsylvania Railroad (PRR), while others ran upstate in Pennsylvania on the RDG, until early 1957. Some T-1s were also loaned as steam generators to Steel mills. Upon returning to the RDG the following year, the PRR-leased locomotives, with the exception of No. 2128, were ...
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Besides the R1, the PRR did not build or order any other 4-8-4 locomotives, however the T1 duplex was essentially a 4-8-4 with two sets of driving wheels as a 4-4-4-4. In many respects the design resembled the earlier, lighter P5, but with an extra driving axle and lower axle loads.
These were both withdrawn from service by the mid-1920s. In 1942, the PRR built 123 2-10-4 "Texas" type locomotives based on C&O plans; class J now being unoccupied, it was reused for them. The PRR J1 was an improved version of its C&O counterpart with more pulling power. J1 - 2-10-4 freight locomotives. J28 - experimental 2-6-2 locomotives.
Based on the experience gained from the S1, PRR improved the design of the T1. A total of 52 of them were ordered from 1940 to 1945. According to an official report from PRR dated December 1, 1945, which is now stored in The Hagley Museum and Library, No. 6100 was awaiting engine truck repairs at Crestline. It was expected to be returned in ...