Great Central classes 11B, C and D
London & North Eastern class D9
Great Britain 1901 40 produced
One of Robinson's first developments was the class 11B, which was intended to meet the increased demands of new lines. They were similar to the class 9J “Pom-Poms” freight locomotives and were therefore also called “Pom-Pom Bogies”. On some lines they could reach an average of 60 mph (97 km/h). In terms of power, they were soon outperformed by Robinson's newer designs and rebuilt. Only two locomotives received a new saturated boiler and became class 11C. Between 1909 and 1927, all other locomotives were rebuilt with a different boiler, which was delivered directly with a superheater from 1913. The last ones were able to remain in service until 1950.
Technical data
General
- Built
- 1901-1904
- Manufacturers
- Sharp, Stewart & Co., Vulcan Foundry
- Wheel arrangement
- 4-4-0 (American)
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Wheelbase
- 7.28 m
- Total wheelbase
- 13.61 m
- Service mass
- 53.4 t
- Adhesion mass
- 36 t
- Total mass
- 100.2 t
- Rigid wheelbase
- 2.74 m
- Axle load
- 18.8 t
- Water capacity
- 18,185 l
- Fuel capacity
- 5.1 t (coal)
Boiler
- Grate area
- 1.858 m²
- Firebox surface
- 10.126 m²
- Tube heating surface
- 122.493 m²
- Evaporative heating surface
- 132.619 m²
- Superheater surface
- 28.243 m²
- Total heating surface
- 160.9 m²
Power plant
- Driver diameter
- 2,057 mm
- Boiler pressure
- 12.4 bar
- Expansion type
- simple expansion
- Cylinders
- two, 470 x 660 mm
Power
- Power source
- steam
- Estimated power
- 708 kW (963 PS)
- Starting effort
- 74.8 kN
Calculated values
- Factor of adhesion
- 1 : 4.72
- Optimal speed
- 58 km/h
- Power-to-weight ratio
- 13.2 kW/t
- Heating Surface Equivalent
- 239.7 m²
- Cylinder volume/HSE
- 1 : 955.45
- Adhesive weight/Total
- 1 : 1.49
- Tractive force/Heating surface
- 1 : 9.71
- Grate area/Heating surface
- 1 : 86.58
- Firebox/Tube surface
- 1 : 12.10
- Total/Superheater
- 1 : 4.70
