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PRR D3 #274 in its builders' portrait. | |||||||||||||||||||||||||||||||||||||||
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ThePennsylvania Railroad'ssteam locomotive classD3 (formerly ClassC, pre-1895) comprised sixty-seven4-4-0 locomotives intended for generalpassenger andfreight service, constructed at the railroad's own Altoona Works (now owned byNorfolk Southern) during 1869–1881.[2]They were the third standardized class of locomotives on the railroad and the most numerous of the early standard types; they shared many parts with other standard classes.[3]
This design differed from the Class A (later D1) mainly in its smallerdrivers for greatertractive effort for freight haulage. Like all the early standardized 4-4-0s on the PRR, the Class C had a wagon-top boiler with steam dome and afirebox between the two driving axles.[2][4]