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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.
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 ...
However before it could be built, the PRR placed an order for two locomotives of this type in July 1940. This implied that the S1 was a showpiece exclusively built for the World's Fair instead of replacing the K4s as the new prime power of the PRR. The PRR T1 was developed when the S1 was under construction or on display in the World Fair. [30]
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.
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.
The M1 was a class of steam locomotive of the Pennsylvania Railroad (PRR). It was a class of heavy mixed-traffic locomotives of the 4-8-2 "Mountain" arrangement, which uses four pairs of driving wheels with a four-wheel guiding truck in front for stability at speed and a two-wheel trailing truck to support the large firebox needed for sustained power.
Besides PRR S1 #6100, streamlined K4s, PRR S2 direct-drive steam turbine engine #6200, and PRR T1 were assigned to haul the train occasionally. In 1948, PRR re-equipped the Trail Blazer with new EMD E8 Diesel engines, new lightweight P85b 44-seat coaches and new twin-unit dining car built by PRR's own shop and ACF. In 1949, the westbound ...