The PRR C1 was the Pennsylvania Railroad's class of 0-8-0 steam locomotive, used in switching service.

The locomotive type was built at the railroad's Juniata shops in Altoona, Pennsylvania and introduced in 1925.

The PRR wanted the best motive power to handle the switching chores at rail 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.

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