GWR steam rail motors

GWR steam railmotor (dimensions from No. 2)[1]
No. 93 after restoration in 2013
Type and origin Power type Steam Designer George Jackson Churchward Builder GWR Swindon Works Kerr, Stuart and Company Gloucester Railway Carriage and Wagon Company Build date 1903–1908 Total produced 99
Specifications Configuration: ​  • Whyte 0-4-0TR (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)
Performance figures Tractive effort 6,398 lbf (28.46 kN)
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.