Reading Company C1a Class

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.

P&RR C1a class
Type and origin
Power typeSteam
BuilderReading Company
Build date1915
Total produced4
Specifications
Configuration:
  Whyte4-4-4
Gauge4 ft 8 12 in (1,435 mm)
Driver dia.6 ft 8 in (2.032 m)
Loco weight230,800 lb (104,700 kg)
Fuel typeCoal
Boiler pressure240 psi (1.65 MPa)
CylindersTwo, outside
Cylinder size23.5 in × 26 in (597 mm × 660 mm)
Performance figures
Tractive effort36,604 lbf (162.82 kN)
Career
Withdrawn1916
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