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The reference for locomotives and railcars

Great Western Railway class 6800 “Grange”

Great Britain 1936 80 produced
Newly built No. 6880 “Betton Grange” in May 2024 at Toddington station BWard 1997 CC BY 4.0

As early as in 1901, Churchward's program of standard locomotives for the GWR included a two-cylinder 4-6-0 mixed traffic class. For the time being, this was not built and ten years later, the 2-6-0 class 4300 was built for similar duties. Only Collett actually built the mixed-traffic 4-6-0s, starting with the Hall class in 1924. While this had driving wheels with a diameter of six feet, the Grange class shown here had a diameter of only five feet and eight inches to increase pulling power, with the cylinder dimensions remaining the same.

To replace the class 4300, a total of 80 were built between 1936 and 1939 and named after granges in the GWR area. Hence the wheels, valve motions and tenders of withdrawn class 4300 locomotives were re-used. Since the axle load of the Grange class was somewhat higher than that of the 4300, they could not be used on all lines. This prompted Collett to build the Manor class as a lighter variant. All Grange class locomotives were withdrawn and scrapped between 1960 and 1965. In 1998, construction of No. 6880 “Betton Grange” was started. It was steamed up for the first time on April 11, 2024.

No. 6866 “Morfa Grange” in front of No. 6824 “Ashley Grange” at Southall Depot in November 1962 Ben Brooksbank / CC BY-SA 2.0
Locomotive Magazine, October 1936

Technical data

General

Built
1936-1939
Manufacturers
Swindon
Wheel arrangement
4-6-0 (Ten-wheeler)
Gauge
1,435 mm (Standard gauge)

Dimensions and weights

Length
19.21 m
Wheelbase
8.26 m
Total wheelbase
12.93 m
Service mass
75.2 t
Adhesion mass
56 t
Total mass
115.8 t
Rigid wheelbase
4.50 m
Axle load
18.7 t
Water capacity
15,910 l
Fuel capacity
7.1 t (coal)

Boiler

Grate area
2.515 m²
Firebox surface
14.38 m²
Tube heating surface
142.348 m²
Evaporative heating surface
156.728 m²
Superheater surface
23.504 m²
Total heating surface
180.2 m²

Power plant

Driver diameter
1,727 mm
Boiler pressure
15.5 bar
Expansion type
simple expansion
Cylinders
two, 470 x 762 mm

Power

Power source
steam
Estimated power
1,305 kW (1,774 PS)
Starting effort
128.5 kN

Calculated values

Factor of adhesion
1 : 4.28
Optimal speed
63 km/h
Power-to-weight ratio
17.4 kW/t
Heating Surface Equivalent
275.6 m²
Cylinder volume/HSE
1 : 958.85
Adhesive weight/Total
1 : 1.34
Tractive force/Heating surface
1 : 14.89
Grate area/Heating surface
1 : 71.66
Firebox/Tube surface
1 : 9.90
Total/Superheater
1 : 6.67
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