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Photos of PRR 4-4-4-4 locomotives; An N Scale PRR T1 4-4-4-4 scratch building project; A group that intends to build a full-size PRR T1; YouTube video displaying the operation of T1's on the Pennsylvania Railroad - At 3 minutes and 15 seconds, an example of the T1's infamous wheel slip can be observed.
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 ...
[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.
PRR T1 4-4-4-4 duplex No. 5550: The Pennsylvania Railroad built 52 4-4-4-4 duplex locomotives for passenger service, and the last one was scrapped in 1956. The Pennsylvania Railroad T1 Steam Locomotive Trust was created to construct a fully functional 53rd member of the T1 class. The new T1, to be numbered 5550, is expected to be completed by ...
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.
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