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Great Eastern class 245

Great Britain 1879 20 produced
flickr/Historical Railway Images

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 All locomotives of this class were withdrawn between 1890 and 1893, well before the introduction of Holden's P43 class of bogie singles.

Locomotive Magazine, March 1911

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
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