British Rail Standard class 2 tank
The smallest tank locomotive of the BR standard program was the class 2 tank with a 2-6-2T wheel arrangement. It was derived from the LMS Ivatt class 2 2-6-2T and intended for mixed traffic. It had a smaller loading gauge than its LMS prototype and had a number of standard fittings. A very similar standard locomotive was the class 2 2-6-0.
Since there were already 130 Ivatt 2-6-2T, BR only ordered 30 of the standard type. The first 20 were built in Crewe and used in former LMS area. The other ten were built in Darlington and used in the Southern region. After they also came to other regions, their service life ended between 1963 and 1966. Since none were preserved, the Bluebell Railway is now rebuilding 2-6-0 No. 78059 into 2-6-2T No. 84030.
Technical data
General
- Built
- 1953-1957
- Manufacturers
- Crewe, Darlington
- Wheel arrangement
- 2-6-2T (Prairie)
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Length
- 11.82 m
- Wheelbase
- 9.22 m
- Service mass
- 67.3 t
- Adhesion mass
- 41.9 t
- Rigid wheelbase
- 4.19 m
- Axle load
- 14.2 t
- Water capacity
- 25,438 l
- Fuel capacity
- 0.7 t (coal)
Boiler
- Grate area
- 1.626 m²
- Firebox surface
- 9.383 m²
- Tube heating surface
- 85.842 m²
- Evaporative heating surface
- 95.226 m²
- Superheater surface
- 11.52 m²
- Total heating surface
- 106.7 m²
Power plant
- Driver diameter
- 1,524 mm
- Boiler pressure
- 13.8 bar
- Expansion type
- simple expansion
- Cylinders
- two, 419 x 610 mm
Power
- Power source
- steam
- Estimated power
- 634 kW (862 PS)
- Starting effort
- 82.3 kN
Calculated values
- Factor of adhesion
- 1 : 4.99
- Optimal speed
- 47 km/h
- Power-to-weight ratio
- 9.4 kW/t
- Heating Surface Equivalent
- 165.2 m²
- Cylinder volume/HSE
- 1 : 1,018.22
- Adhesive weight/Total
- 1 : 1.61
- Tractive force/Heating surface
- 1 : 16.11
- Grate area/Heating surface
- 1 : 65.65
- Firebox/Tube surface
- 1 : 9.15
- Total/Superheater
- 1 : 8.27
