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Accomplishing such tasks typically required the use of two engines pulling a single train (double-heading).
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In 1937, PRR sought to design a coal-burning steam locomotive that would pull heavy passenger trains for long runs at better than 60 mph (97 km/h). government and a workforce of approximately 250,000 people. At one time, PRR was the largest publicly traded corporation in the world, with a budget larger than that of the U.S. In the first half of the 20th century, PRR was the largest railroad by traffic and revenue in the United States. The Pennsylvania Railroad (PRR) was founded in 1846 and headquartered in Philadelphia, Pennsylvania.
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Note the dual stacks protruding slightly above the engine’s streamlined claddin The S1 was the longest and heaviest rigid frame reciprocating steam passenger locomotive ever built. The Pennsylvania Railroad S1 engine 6100 in February 1939, shortly after completion.
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