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Pennsylvania Railroad C1
PRR C1 6560.jpg
PRR C1 locomotive #6560. Photographed at Louisville, KY, 28 June 1950 by Otto Perry
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 12 in (1,435 mm)
Driver dia. 56 in (1.422 m)
Axle load 74,000 lb (33.6 t)
Loco 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)
Numbers 6550–6639
Retired 1948–1953
Disposition all scrapped

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.