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  2. Pennsylvania Railroad class T1 - Wikipedia

    en.wikipedia.org/wiki/Pennsylvania_Railroad_class_T1

    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.

  3. Pennsylvania Railroad 5550 - Wikipedia

    en.wikipedia.org/wiki/Pennsylvania_Railroad_5550

    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.

  4. Duplex locomotive - Wikipedia

    en.wikipedia.org/wiki/Duplex_locomotive

    A nonprofit group known as the T1 Trust is in the process of constructing a new duplex locomotive, a T1-class engine known as Pennsylvania Railroad 5550, intending to utilize design improvements from the postwar steam era not used or seldom tested on pre-existing T1s in the hope of creating better performance characteristics. The estimated year ...

  5. Reading T-1 Class - Wikipedia

    en.wikipedia.org/wiki/Reading_T-1_Class

    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 ...

  6. PRR T1 - Wikipedia

    en.wikipedia.org/?title=PRR_T1&redirect=no

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  7. Poppet valve - Wikipedia

    en.wikipedia.org/wiki/Poppet_valve

    The poppet valve was also used on the American Pennsylvania Railroad's T1 duplex locomotives, although the valves commonly failed because the locomotives were commonly operated in excess of 160 km/h (100 mph), and the valves were not meant for the stresses of such speeds. The poppet valves also gave the locomotive a distinctive "chuffing" sound.

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  9. Manhattan Limited - Wikipedia

    en.wikipedia.org/wiki/Manhattan_Limited

    Here is a list of motive power used on the Manhattan Limited: . PRR E6 4-4-2 type steam locomotive; PRR K4s 4-6-2 type steam locomotive; PRR S1 6-4-4-6 type steam locomotive; PRR S2 6-8-6 type steam turbine locomotive