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Great Central class 9N
London & North Eastern class A5
Great Britain | 1911 | 44 produced
Locomotive Magazine, June 1923

Robinson developed these heavy GCR class 9N tank locomotives for fast suburban traffic. With a driving wheel diameter of 5 feet and 7 inches or 1,702 mm and three coupled axles, they were also able to achieve good acceleration. Otherwise they were state-of-the-art with piston valves and superheaters. Between 1910 and 1917, 21 locomotives were built in GCR's Gorton works.

The second production lot was delayed until after the First World War. In 1923, ten more were built with adjustments by Gresley, including a smaller heating surface. These were now being built by Hawthorn, Leslie & Co. as were the next 13 in 1925 and 1926.

The previous class 9N became the A5 at the LNER. In order to be able to distinguish the first and second series, these became the A5/1 and A5/2. British Railways took over 43 of 44 locomotives. The rest were retired between 1957 and 1960.

VariantA5/1A5/2
General
Built1911-19171923-1926
ManufacturerGortonHawthorn, Leslie & Co.
Axle config4-6-2T (Pacific) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length42 ft 11 7/8 in
Wheelbase32 ft 9 in
Fixed wheelbase13 ft
Service weight185,920 lbs192,640 lbs
Adhesive weight120,960 lbs
Axle load41,840 lbs
Water capacity2,738 us gal
Fuel capacity9,296 lbs (coal)
Power
Power sourcesteam
Estimated power975 hp (727 kW)925 hp (690 kW)
Optimal speed29 mph28 mph
Starting effort21,110 lbf
Power Plant
Driver diameter67 in
Boiler pressure160 psi
Expansion typesimple
Cylinderstwo, 20 x 26 in
Boiler
Grate area21 sq ft
Firebox area141 sq ft141.3 sq ft
Tube heating area1,294 sq ft1,138.7 sq ft
Evaporative heating area1,435 sq ft1,280 sq ft
Superheater area214 sq ft178 sq ft
Total heating area1,649 sq ft1,458 sq ft
Calculated Values
steam locomotive
passenger
tank locomotive
John George Robinson
Herbert Nigel Gresley
last changed: 03/2023
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