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London & North Western class G1
London, Midland & Scottish class 6F
Great Britain | 1912 | 449 produced
flickr/stratfordman72

In 1912, a single LNWR class G locomotive was fitted with a superheater and piston valves to evaluate if superheating was of use for goods service. As the outcome was positive, it was decided to rebuild further locomotives in the same way and designate them as class G1. Between 1912 and 1918, 277 further locomotives were either rebuilt from class B, or from classes C, D, E, F or G which had already been rebuilds from class A or B. The classes E and F which had been rebuilt to the wheel arrangement 2-8-0 again lost their leading axle

Between 1917 and 1934, the LNWR and the LMS built another 171 new. Later 320 were rebuilt to class G2A with a boiler that had a pressure of 175 instead of 160 psi. Some were even rebuilt back to G1 standard when they needed an overhaul. When British Railways were founded in 1948, 98 non-rebuilt were still in service.

General
Built1912-1934
ManufacturerCrewe
Axle config0-8-0 (Eight-coupled) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase17 ft 3 in
Fixed wheelbase17 ft 3 in
Service weight136,640 lbs
Adhesive weight136,640 lbs
Total weight224,560 lbs
Axle load39,200 lbs
Water capacity3,603 us gal
Fuel capacity11,760 lbs (coal)
Power
Power sourcesteam
Estimated power975 hp (727 kW)
Optimal speed24 mph
Starting effort25,639 lbf
Power Plant
Driver diameter53.5 in
Boiler pressure160 psi
Expansion typesimple
Cylinderstwo, 20 1/2 x 24 in
Boiler
Grate area23.6 sq ft
Firebox area146.7 sq ft
Tube heating area1,772 sq ft
Evaporative heating area1,918.7 sq ft
Superheater area380 sq ft
Total heating area2,298.7 sq ft
Calculated Values
steam locomotive
freight
George Whale
last changed: 05/2024
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