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PRR C1 locomotive No. 6560 at Louisville, KY,  June 28 1950.  Photo by Otto Perry.
By http://digital.denverlibrary.org/cdm/ref/collection/p15330coll22/id/64088, Fair use, https://en.wikipedia.org/w/index.php?curid=1277480

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Pennsylvania Railroad C1 Class 0-8-0 Steam Locomotive
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 76,154 lb, based on 78% MEP with 60% maximum cutoff. The C1s were retired between 1948 and 1953.

None survive today.

Pennsylvania Railroad C1 Overview
Type and origin
Power type: Steam
Builder: Pennsylvania Railroad
Build date: 1925, 1927
Total produced: 90
Configuration: 0-8-0
UIC class: Dh
Gauge: 4 ft 8 1⁄2 in (1,435 mm)
Driver diameter: 56 in (1.422 m)
Axle load: 74,000 lb (33.6 t)
Locomotive weight: 278,000 lb (126.1 t)
Boiler pressure: 250 psi (1.72 MPa)
Cylinders Two
Cylinder size: 27 in × 30 in (686 mm × 762 mm)
Performance figures
Tractive effort: 76,154 lbf (338.7 kN)
Road Numbers: 6550–6639
Retired: 1948–1953
Disposition: all scrapped

See also:

USRA 0-8-0

PRR Locomotives

Steam Locomotives