Reading Company C1a Class

P&RR C1a class

Type and origin
Power type	Steam
Builder	Reading Company
Build date	1915
Total produced	4

Specifications
Configuration	4-4-4
Gauge	4 ft 8 ¹⁄₂ in (1,435 mm)
Driver dia.	6 ft 8 in (2.032 m)
Loco weight	230,800 lb (104,700 kg)
Fuel type	Coal
Boiler pressure	240 psi (1.65 MPa)
Cylinders	Two, outside
Cylinder size	23.5 in × 26 in (597 mm × 660 mm)

Performance figures
Tractive effort	36,604 lbf (162.82 kN)

Career
Withdrawn	1916

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.

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