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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.
A 4-4-6-4, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is one that has four leading wheels followed by four coupled driving wheels, a second set of six coupled driving wheels and four trailing wheels. The Pennsylvania Railroad's Q2 class were the
The Q class comprised what were effectively 4-10-4s with the driving axles split into two driven groups. The Q2 was the most powerful non-articulated steam locomotive ever built and also holds the record for highest horsepower recorded by any steam locomotive at 7,987 hp. Q1 - experimental duplex freight locomotive. Q2 - duplex freight locomotive.
Pages in category "Steam locomotives of the United States" ... Pennsylvania Railroad Q2 class; Pittsburgh and Lake Erie class A-2a; Pennsylvania Railroad class B6;
Pennsylvania Railroad 460; Pennsylvania Railroad 520; Pennsylvania Railroad 1223; Pennsylvania Railroad 1361; Pennsylvania Railroad 1737; Pennsylvania Railroad 3750; Pennsylvania Railroad 4800; Pennsylvania Railroad 4859; Pennsylvania Railroad 4876; Pennsylvania Railroad 4877; Pennsylvania Railroad 4935; Pennsylvania Railroad 5550; Pennsylvania ...
In operation, the Q2 could outperform pre-existing freight engines hauling double the tonnage of their predecessors. Furthermore, the Q2 had no problems building up steam power and was known to be a very smooth-riding engine. 26 were built at PRR's Altoona Works, and they were by far the most successful duplex type. The duplex propensity to ...
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. The S1 class was the largest rigid frame passenger steam locomotive ever built. [1]
The Pennsylvania Railroad K4 was a class of 425 4-6-2 steam locomotives built between 1914 and 1928 for the PRR, where they served as the primary main line 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.
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