| P&RR C1a class |
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 Reading No. 110, as built |
| Type and origin |
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| Power type | Steam |
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| Builder | Reading Company |
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| Build date | 1915 |
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| Total produced | 4 |
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| Specifications |
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Configuration:
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| • Whyte | 4-4-4 |
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| Gauge | 4 ft 8+1⁄2 in (1,435 mm) |
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| Driver dia. | 6 ft 8 in (2.032 m) |
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| Loco weight | 230,800 lb (104,700 kg) |
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| Fuel type | Coal |
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| Boiler pressure | 240 psi (1.65 MPa) |
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| Cylinders | Two, outside |
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| Cylinder size | 23.5 in × 26 in (597 mm × 660 mm) |
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The C1a Class were a type of 4-4-4 steam locomotive built for the Philadelphia and Reading Railway in 1915. Four locomotives were built, road numbers #110-113. They used front and rear trucks that were effectively identical. During a year of operation, they proved to be quite unstable; after that year, they were rebuilt to 4-4-2 "Atlantic" locomotives, reclassified as P7sa, and renumbered #350-353.[1]
References