Pennsylvania Railroad class D6
Pennsylvania Railroad D6 | ||
---|---|---|
Factor of adh. | 5.3 (D6) 4.6 (D6a) |
Class D6 (formerly Class K, pre-1895) on the Pennsylvania Railroad was a class of 4-4-0 steam locomotive.[3] Nineteen were built by the PRR's Altoona Works (now owned by Norfolk Southern) between 1881 and 1883. They were equipped with 78-inch (1,981 mm) drivers.[1] Seven were later converted to 72-inch (1,829 mm) drivers and classified D6a.[1]
The D6 was one of the first American 4-4-0s to place the firebox above, rather than between, the locomotive's frames.[4] This added about 8 inches to the possible width of the firebox, enabling a larger, easier to fire and more powerful locomotive; the maximum fire grate area increased to about 35 sq ft (3.25 m2) from the previous maximum of about 18 sq ft (1.67 m2).[5]
The innovation was not wholly new, having been first seen on the
References
- ^ a b c d e "PRR Steam Roster". Northeast Rails. Retrieved December 31, 2007.
- ^ a b c d e f g h i j k l m n o p Pennsylvania Railroad. "D6 Diagram". PRR.Railfan.net. Retrieved December 31, 2007.
- ^ LCCN 62020878.
- ^ Gunsaulus, Frank W. (ed.) (1906). Modern Engineering Practice. American School of Correspondence.
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has generic name (help) - ^ "Mechanical Stokers for Locomotives". Cassier's Magazine. Vol. XXXII, no. 1. New York: Cassier Magazine. May 1907. p. 75.
- Cincinnati, Ohio: Aldine. 1886.