PRR C1
Pennsylvania Railroad C1|

PRR C1 locomotive #6560. Photographed at Louisville, KY., 28 June 1950 by Otto Perry |
| Type and origin |
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| Power type |
Steam |
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| Builder |
Pennsylvania Railroad |
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| Build date |
1925, 1927 |
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| Total produced |
90 |
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| Career |
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| Numbers |
6550–6639 |
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| Retired |
1948–1953 |
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| Disposition |
all scrapped |
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The PRR C1 was the Pennsylvania Railroad's class of 0-8-0 steam locomotive, used in switching service. The 0-8-0 was common on most railroads, but not on PRR; when the railroad needed bigger motive power, they used the 2-8-0 "Consolidation". PRR wanted the best motive power to handle the switching chores at yards and interchanges and the C1 class was the heaviest two-cylinder 0-8-0 switcher ever produced. Calculated tractive effort was 76154 lb, based on 78% MEP with 60% maximum cutoff. The C1s were retired between 1948 and 1953.
None survive today.