Rhymney Railway class M
Great Britain 1904 6 produced
The Class M was the first variant in a series of Rhymney Railway tank locomotives that led to the class 5600 of the GWR. It had been developed by Richard Jenkins and had three driving axles with relatively small wheels in order to achieve high tractive power for the heavy coal trains. Although some successor class P and A engines were later rebuilt to a similar level as the 5600, only one class M loco was so rebuilt. All came to the GWR in 1923 and British Railways received three in 1948, which were retired by 1951.
Technical data
General
- Built
- 1904
- Manufacturers
- Robert Stephenson & Co.
- Wheel arrangement
- 0-6-2T (Webb)
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Length
- 11.20 m
- Wheelbase
- 6.63 m
- Service mass
- 63 t
- Rigid wheelbase
- 4.65 m
- Water capacity
- 6,363 l
- Fuel capacity
- 3 t (coal)
Boiler
- Grate area
- 1.076 m²
- Firebox surface
- 11.334 m²
- Tube heating surface
- 116.315 m²
- Evaporative heating surface
- 127.649 m²
- Total heating surface
- 127.6 m²
Power plant
- Driver diameter
- 1,372 mm
- Boiler pressure
- 11.4 bar
- Expansion type
- simple expansion
- Cylinders
- two, 470 x 660 mm
Power
- Power source
- steam
- Estimated power
- 336 kW (457 PS)
- Starting effort
- 102.8 kN
Calculated values
- Optimal speed
- 19 km/h
- Power-to-weight ratio
- 5.3 kW/t
- Heating Surface Equivalent
- 184.3 m²
- Cylinder volume/HSE
- 1 : 1,242.70
- Tractive force/Heating surface
- 1 : 16.82
- Grate area/Heating surface
- 1 : 118.63
- Firebox/Tube surface
- 1 : 10.26
