The Pennsylvania Railroad's steam locomotive class D1 (formerly Class A, pre-1895) comprised thirteen 4-4-0 locomotives for express passenger service, constructed at the railroad's own Altoona Works (now owned by Norfolk Southern) during 1868–1872.[3] They were the first standardized class of locomotives on the railroad and shared many parts with other standard classes.[1]
| PRR D1 | |||||||||||||||||||||||||||||||||||||||
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 D1 #28 | |||||||||||||||||||||||||||||||||||||||
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The PRR was the first American railroad to adopt the Westinghouse air brake, the first tests of which were made in September 1869; Class A locomotives were among those fitted with air brake equipment for those earliest tests.[4][5]
They remained in service until 1945, and were all withdrawn and scrapped by 1946.
References
edit- ^ a b c Dredge, James (1879). The Pennsylvania Railroad. London: Engineering magazine.
- ^ a b c d e f g h i j Pennsylvania Railroad. "Class D1 diagram". PRR.Railfan.net. Retrieved 2008-08-19.
- ^ "PRR Steam Roster". Northeast Rails. Retrieved 2007-12-31.
- ^ Staufer, Alvin F. & Pennypacker, Bert (1962). Pennsy Power: Steam and Electric Locomotives of the Pennsylvania Railroad, 1900–1957. Staufer. LCCN 62020878.
- ^ Warner, Paul T. (1924). Motive Power Development on the Pennsylvania Railroad System. Philadelphia: Baldwin Locomotive Works.
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