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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.
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.
The PRR S1 class steam locomotive (nicknamed "The Big Engine") was a single experimental duplex locomotive of the Pennsylvania Railroad. It was designed to demonstrate the advantages of duplex drives espoused by Baldwin Chief Engineer Ralph P. Johnson. [1] The streamlined Art Deco styled shell of the locomotive was designed by Raymond Loewy. [1 ...
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.
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 locomotive was 78% more powerful than the locomotives that PRR had in service at the time, and the company claimed the Q2 could pull 125 freight cars at a speed of 50 mph (80 km/h). [5] These were an improved version of the previous Q1 class , which was a 4-6-4-4 dual-purpose engine instead of a 4-4-6-4 freight engine.
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.
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.