British Rail Standard class 3 tank
Great Britain 1952 45 produced
For power class 3, first a tank locomotive with a 2-6-2 wheel arrangement was developed. Its running gear was based on that of the Ivatt class 4 tender locomotive of the LMS, and other parts also came from this. However, the boiler was based on the GWR's standard No. 2 boiler used on the class “Large Prairie” 5101 and the class 5600. Shortly after the last locomotives were put into service, diesel multiple units were delivered, which contested part of their service area. Nevertheless, the first withdrawals did not take place until 1964 and the last ones were completed in 1967.
Technical data
General
- Built
- 1952-1955
- Manufacturers
- Swindon
- Wheel arrangement
- 2-6-2T (Prairie)
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Length
- 12.46 m
- Wheelbase
- 9.93 m
- Service mass
- 76.2 t
- Adhesion mass
- 50.3 t
- Rigid wheelbase
- 4.62 m
- Axle load
- 16.8 t
- Water capacity
- 6,818 l
- Fuel capacity
- 3 t (coal)
Boiler
- Grate area
- 1.891 m²
- Firebox surface
- 11.002 m²
- Tube heating surface
- 85.803 m²
- Evaporative heating surface
- 96.805 m²
- Superheater surface
- 17.187 m²
- Total heating surface
- 114.0 m²
Power plant
- Driver diameter
- 1,600 mm
- Boiler pressure
- 13.8 bar
- Expansion type
- simple expansion
- Cylinders
- two, 444 x 660 mm
Power
- Power source
- steam
- Estimated power
- 690 kW (938 PS)
- Starting effort
- 95.6 kN
Calculated values
- Factor of adhesion
- 1 : 5.16
- Optimal speed
- 43 km/h
- Power-to-weight ratio
- 9.1 kW/t
- Heating Surface Equivalent
- 186.2 m²
- Cylinder volume/HSE
- 1 : 1,100.82
- Adhesive weight/Total
- 1 : 1.52
- Tractive force/Heating surface
- 1 : 17.51
- Grate area/Heating surface
- 1 : 60.28
- Firebox/Tube surface
- 1 : 7.80
- Total/Superheater
- 1 : 5.63
