London & North Western class 380
London, Midland & Scottish class 5F
Great Britain 1923 30 produced
Instead of ordering another batch of the class 1185 with a 0-8-2T wheel arrangement, H.P.M. Beames developed the class 380 with a two-axle trailing bogie to get more space for the supplies. Their area of application was the steep and winding lines in the valleys of South Wales, on which they were to pull freight trains and, if necessary, also be used in front of passenger trains. When the locomotives were delivered, the LNWR had already been merged into the LMS, where they were classified in power class 5F. 14 of the 30 locos survived the founding of British Railways, but these were retired by 1951.
Technical data
General
- Built
- 1923-1924
- Manufacturers
- Crewe
- Wheel arrangement
- 0-8-4T
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Service mass
- 89.4 t
- Adhesion mass
- 67.6 t
- Water capacity
- 9,229 l
- Fuel capacity
- 3.6 t (coal)
Boiler
- Grate area
- 2.183 m²
- Evaporative heating surface
- 156.728 m²
- Superheater surface
- 33.352 m²
- Total heating surface
- 190.1 m²
Power plant
- Driver diameter
- 1,346 mm
- Boiler pressure
- 12.8 bar
- Expansion type
- simple expansion
- Cylinders
- two, 521 x 610 mm
Power
- Power source
- steam
- Estimated power
- 783 kW (1,065 PS)
- Starting effort
- 133.1 kN
Calculated values
- Factor of adhesion
- 1 : 4.98
- Optimal speed
- 35 km/h
- Power-to-weight ratio
- 8.8 kW/t
- Adhesive weight/Total
- 1 : 1.32
- Tractive force/Heating surface
- 1 : 14.63
- Grate area/Heating surface
- 1 : 87.07
- Total/Superheater
- 1 : 4.70