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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.
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 ...
B&O created a single 4-4-4 in 1934, rebuilding a 4-4-2 "Atlantic" into a solitary class J-1, named Lady Baltimore. This and the single class V-2 4-6-4 Lord Baltimore were built for new lightweight passenger trains. In the Lady Baltimore's case the Abraham Lincoln on the Chicago and Alton Railroad, a wholly owned subsidiary of the B&O. Despite ...
The 4-6-4 arrangement was seen on the PRR only on electric locomotives. As a steam locomotive arrangement, it was poorly suited to the PRR's mountainous terrain, wasting much potential adhesive weight on non-driven wheels. That it was so widely used by the rival New York Central would also likely have factored against PRR adoption.
[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 Q2 4-4-6-4 was the most successful example of the duplex locomotive constructed by the PRR. Production locomotives followed from the end of 1944, but these were rather different, the lesson that backward-facing cylinders next to the firebox were a poor design choice made clear.
4-6-4-4 wheel arrangement The PRR Q1 6130 - the only locomotive with this wheel arrangement In Whyte notation , a 4-6-4-4 is a railroad steam locomotive that has four leading wheels followed by six coupled driving wheels , a second set of four driving wheels and four trailing wheels .
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.