Self-propelled steam carriages operated by the Great Western Railway.
GWR steam railmotor (dimensions from No. 2)[ 1] No. 93 after restoration in 2013
Specifications Configuration: • Whyte 0-4-0 T R (power bogie)Gauge standard gauge Coupled dia. 4 ft 0 in (1.219 m) Wheelbase 8 ft 0 in (2.438 m) • Coupled 3 ft 8 in (1.118 m) • Trailing 3 ft 7 in (1.092 m) (unpowered bogie) Length: • Over headstocks 57 ft 0+ 3 ⁄4 in (17.393 m) Width 8 ft 6+ 3 ⁄4 in (2.610 m)Height 13 ft 4+ 1 ⁄2 in (4.077 m)Fuel capacity 0.5 t; 0.6 short tons Water cap. 450 imp gal (2,000 L; 540 US gal) Firebox: • Grate area 11.46 sq ft (1.065 m2 ) Boiler: • Model Fire tube • Type Vertical • Diameter 4 ft 6 in (1.372 m)–6 ft 0 in (1.829 m) • Tube plates 4 ft 4+ 3 ⁄4 in (1.340 m) • Small tubes 477 x 1+ 1 ⁄8 in (0.029 m) Boiler pressure 140 psi (0.97 MPa ) Heating surface: • Firebox 44.34 sq ft (4.119 m2 ) • Tubes 625.58 sq ft (58.118 m2 ) • Total surface 669.92 sq ft (62.238 m2 ) Cylinders 2 Cylinder size 12 in × 16 in (305 mm × 406 mm)
Career Preserved 1 Disposition 98 scrapped
The steam rail motors (SRM) were self-propelled carriages operated by the Great Western Railway in England and Wales from 1903 to 1935. They incorporated a steam locomotive within the body of the carriage.