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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.
John Edgar Thomson (1808–1874) was the entrepreneur who led the Pennsylvania Railroad from 1852 until his death in 1874, making it the largest business enterprise in the world and a world-class model for technological and managerial innovation.
T1 prototype PRR 6110 at the Baldwin Locomotive Works in 1942. The S1 did not represent Baldwin's true desires for the type, but in the design of the T1, of which two prototypes were ordered in July 1940, Baldwin was given much more freedom. The PRR's requirements were the use of the Belpaire firebox and the Franklin oscillating-cam poppet ...
These were both withdrawn from service by the mid-1920s.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.
Pennsylvania Railroad class T1; W. Wikipedia talk:WikiProject Trains/Locomotives task force This page was last edited on 2 January 2014, at 02:50 (UTC). ...
[4] [28] The PRR continued developing the T1 class of 4-4-4-4 duplex locomotives but wheel slip and mechanical failures also plagued the T1. Before Pennsylvania Railroad commissioned Baldwin Locomotive Works for the T1 in 1940, it had already begun developing duplex designs for fast locomotives since 1938, including a rigid-frame 4-2-2-4 and ...
The next locomotives to use the 4-4-4-4 arrangement were the Pennsylvania Railroad's 52 class T1 locomotives (although the single class S1 was originally intended to be a 4-4-4-4, it was later changed to 6-4-4-6 due to increased weight). These had the cylinders in front of the wheels they drove, so that the rear pair were between the two sets ...