GWR steam rail motors

GWR steam railmotor
(dimensions from No. 2)[1]
No. 93 after restoration in 2013
Type and origin
Power typeSteam
DesignerGeorge Jackson Churchward
Builder
Build date1903–1908
Total produced99
Specifications
Configuration:
 • Whyte0-4-0TR (power bogie)
Gaugestandard gauge
Coupled dia.4 ft 0 in (1.219 m)
Wheelbase8 ft 0 in (2.438 m) ​
 • Coupled3 ft 8 in (1.118 m)
 • Trailing3 ft 7 in (1.092 m) (unpowered bogie)
Length:
 • Over headstocks57 ft 0+34 in (17.393 m)
Width8 ft 6+34 in (2.610 m)
Height13 ft 4+12 in (4.077 m)
Fuel capacity0.5 t; 0.6 short tons
Water cap.450 imp gal (2,000 L; 540 US gal)
Firebox:
 • Grate area11.46 sq ft (1.065 m2)
Boiler:
 • ModelFire tube
 • TypeVertical
 • Diameter4 ft 6 in (1.372 m)–6 ft 0 in (1.829 m)
 • Tube plates4 ft 4+34 in (1.340 m)
 • Small tubes477 x 1+18 in (0.029 m)
Boiler pressure140 psi (0.97 MPa)
Heating surface:
 • Firebox44.34 sq ft (4.119 m2)
 • Tubes625.58 sq ft (58.118 m2)
 • Total surface669.92 sq ft (62.238 m2)
Cylinders2
Cylinder size12 in × 16 in (305 mm × 406 mm)
Performance figures
Tractive effort6,398 lbf (28.46 kN)
Career
Preserved1
Disposition98 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.

  1. ^ Jones, Robin (2011). Railmotor: The Steam Engine that Rewrote Railway History. Wellington, Somerset: Halsgrove. p. 24. ISBN 978 0 85704 122 7.