Pennsylvania Railroad 1737 was a 4-6-2 Pacific type K4 classsteam locomotive built in 1914 as the first of its class and would haul heavier passenger trains that the smaller E class 4-4-2Atlantics could not handle such as the PRR's flagship passenger train, the Broadway Limited. In the 1930s, as the PRR had increased passenger service time tables, the trains became longer and heavier than a single K4s could handle, necessitating double-heading with a second engine. The "Standard Railroad Of The World" made attempts to replace the 1737 and its classmates with larger, more powerful classes including: K5, S1, and the T1, none of which were successful; thus, the K4s continued hauling passenger trains until the Pennsylvania Railroad replaced steam locomotives with the increasingly-popular and less-costly diesel-electric locomotives in 1957.
In May 1956, No. 1737 was chosen to be preserved as part of the PRR's Historical Collection at a roundhouse in Northumberland, Pennsylvania.[2] However, the locomotive was stored outside the Northumberland roundhouse, exposed to the elements to the point where it was completely deteriorated in very poor condition to be preserved.[2] Instead, the PRR quietly took another K-4, No. 3750, and renumbered it to represent No. 1737 while the real No. 1737 was broken up for scrap in February 1960.[3]
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