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  2. Duplex locomotive - Wikipedia

    en.wikipedia.org/wiki/Duplex_locomotive

    The production Q2 locomotives were of 4-4-6-4 arrangement; they were the largest non-articulated locomotives ever built and the most powerful locomotives ever static-tested, producing 7,987 hp (5,956 kW) on the PRR's static-test plant. The Q2 locomotives were also the most powerful steam locomotive ever constructed with ten driving wheels.

  3. Pennsylvania Railroad class T1 - Wikipedia

    en.wikipedia.org/wiki/Pennsylvania_Railroad_class_T1

    The first PRR duplex was the single experimental S1 No. 6100 of 1939. It managed to reach 100.97 miles per hour (162.50 km/h) on level track while pulling a 1,350-ton passenger train. Its performance encouraged the PRR to continue to develop duplex steam locomotives.

  4. Pennsylvania Railroad class S1 - Wikipedia

    en.wikipedia.org/wiki/Pennsylvania_Railroad_class_S1

    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 three-cylinder 4-4-4 for lightweight trains and the preliminary design for a 4-4-4-4 for heavy trains; BLW presented these designs to several ...

  5. 4-4-6-4 - Wikipedia

    en.wikipedia.org/wiki/4-4-6-4

    The Pennsylvania Railroad's Q2 class were the only locomotives ever to use this arrangement. These were duplex locomotives, in which both sets of driving wheels were mounted in a common, rigid locomotive frame. This locomotive design was a further development of the highly successful 2-10-4.

  6. Pennsylvania Railroad - Wikipedia

    en.wikipedia.org/wiki/Pennsylvania_Railroad

    PRR Baldwin DS-4-4-660 switcher locomotive PRR EMD E8A passenger locomotive PRR EMD SD45 freight locomotive In June 1937, the Pennsy acquired its first diesel locomotive : a 600-hp diesel-electric switch engine from Electro-Motive Corporation (EMC), a predecessor of General Motors Electro-Motive Division (EMD).

  7. 6-4-4-6 - Wikipedia

    en.wikipedia.org/wiki/6-4-4-6

    The Pennsylvania Railroad's lone S1 was the only 6-4-4-6 ever constructed. A 6-4-4-6 steam locomotive, in the Whyte notation for describing locomotive wheel arrangements, is one with six leading wheels, two sets of four driving wheels, and six trailing wheels. Other equivalent classifications are: