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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 ...
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 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.
The Pennsylvania Railroad K4 was a class of 425 4-6-2 steam locomotives built between 1914 and 1928 for the Pennsylvania Railroad (PRR), where they served as the primary mainline passenger steam locomotives on the entire PRR system until late 1957. Attempts were made to replace the K4s, including the K5 and the T1 duplex locomotive.
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.
Class A was the 0-4-0 type, an arrangement best suited to small switcher locomotives (known as "shifters" in PRR parlance). Most railroads abandoned the 0-4-0 after the 1920s, but the PRR kept it for use on small industrial branches, especially those with street trackage and tight turns. A1; A2; A3; A4; A5s; A6
Pennsylvania Railroad system map in 1893. The Pennsy's charter was supplemented on March 23, 1853, to allow it to purchase stock and guarantee bonds of railroads in other states, up to a percentage of its capital stock. Several lines were then aided by the Pennsy in hopes to secure additional traffic.