Great Eastern class 245
After Johnson had rebuilt two 2-2-2 locomotives into 4-2-2 Bogie Singles, the first class of new built 4-2-2 locomotives of the Great Eastern was introduced in 1879. Designed in Massey Bromley's short tenure, they were in some respects similar to the GNR's Stirling Singles, but had smaller driving wheels and cylinders. At seven and a half feet (2,286 mm), the wheels were still the biggest of the GER, even bigger than those of the class P43 from 1898. Ten were built by Dübs which got the numbers 245 to 254, while ten more built by Kitson got the number 600 to 609. The locomotives built by Kitson had a firebox that was wider, but shallower.
None of these locomotives was ever rebuilt with a new boiler, but these built by Kitson later got some changes in the cylinders, valves and frames. Instead of the splashers with holes, all later got ones with plain sheets. In 1888, No. 251 became the first mainline locomotive to get Holden's design of oil firing apparatus. All locomotives of this class were withdrawn between 1890 and 1893, well before the introduction of Holden's P43 class of bogie singles.
Technical data
General
- Built
- 1879-1882
- Manufacturers
- Dübs & Co., Kitson & Co.
- Wheel arrangement
- 4-2-2 (Single)
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Wheelbase
- 7.04 m
- Service mass
- 42.4 t
- Adhesion mass
- 15.3 t
- Total mass
- 74.6 t
- Rigid wheelbase
- 2.52 m
- Axle load
- 15.3 t
- Water capacity
- 13,938 l
Boiler
- Grate area
- 1.589 m²
- Firebox surface
- 10.257 m²
- Tube heating surface
- 101.748 m²
- Evaporative heating surface
- 112.004 m²
- Total heating surface
- 112.0 m²
Power plant
- Driver diameter
- 2,286 mm
- Boiler pressure
- 10 bar
- Expansion type
- simple expansion
- Cylinders
- two, 457 x 610 mm
Power
- Power source
- steam
- Estimated power
- 336 kW (457 PS)
- Starting effort
- 47.4 kN
Calculated values
- Factor of adhesion
- 1 : 3.18
- Optimal speed
- 43 km/h
- Power-to-weight ratio
- 7.9 kW/t
- Heating Surface Equivalent
- 163.3 m²
- Cylinder volume/HSE
- 1 : 1,225.79
- Adhesive weight/Total
- 1 : 2.76
- Tractive force/Heating surface
- 1 : 8.83
- Grate area/Heating surface
- 1 : 70.49
- Firebox/Tube surface
- 1 : 9.92