The Great Central Railway Class 9N, classified A5 by the LNER, was a class of 4-6-2 tank locomotives designed by John G. Robinson for suburban passenger services. They were fitted with superheaters, piston valves and Stephenson valve gear.

This article relies largely or entirely on a single source. (January 2015)

Quick Facts GCR Class 9N LNER Class A5, Type and origin ...

GCR Class 9N LNER Class A5
A5/1 No. 9828 outside Marylebone station 1947
Type and origin Power type Steam Designer John G. Robinson Builder GCR/LNER Gorton Works (31), Hawthorn Leslie and Company (13) Serial number HL: 3616–3628 Build date 1911–1926 Total produced 44
Specifications Configuration: ​  • Whyte 4-6-2T  • UIC 2′C1′ h2t Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Leading dia. 3 ft 6 in (1.067 m) Driver dia. 5 ft 7 in (1.702 m) Trailing dia. 3 ft 9 in (1.143 m) Length 42 ft 11+7⁄8 in (13.103 m) Loco weight A5/1: 85.90 long tons (87.28 t; 96.21 short tons) A5/2: 90.55 long tons (92.00 t; 101.42 short tons) Fuel type Coal Fuel capacity 4.15 long tons (4.22 t; 4.65 short tons) Water cap. 2,280 imp gal (10,400 L; 2,740 US gal) Boiler pressure 180 psi (1.24 MPa) Cylinders Two, inside Cylinder size 20 in × 26 in (508 mm × 660 mm) Valve gear Stephenson Valve type 10-inch (254 mm) piston valves
Performance figures Tractive effort 23,750 lbf (105.6 kN)
Career Operators Great Central Railway, London & North Eastern Railway, British Railways Power class BR: 4P, 3P from May 1953 Axle load class LNER/BR: Route Availability 5 Withdrawn 1942, 1957–1961 Disposition All scrapped

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The GCR built 21 locomotives at Gorton Works in three batches between 1911 and 1917.^[1] They ordered a fourth batch of ten from Gorton, but this was not built until after the 1923 Grouping, under which GCR became part of the newly formed London and North Eastern Railway (LNER).^[1] The LNER then ordered a fifth batch of 13 to a modified design, incorporating reduced boiler mountings and detail differences, and these were built by the outside contractors Hawthorn, Leslie & Co. during 1925–26 (works numbers 3616–28).^[2]

No. 5447 was withdrawn in 1942 because its frames were badly cracked.^[3] In 1943, the remaining engines were allocated new numbers in the 9800–42 block, but these were not applied until 1946.^[4] Forty-three locomotives passed to British Railways in 1948, and between 1948 and 1951 their numbers were increased by 60000.^[5] The class was divided into two parts in December 1948 as follows:^[2]

• A5/1, 69800-69829: Built at Gorton to Robinson's design
• A5/2, 69830-69842: Built by Hawthorn, Leslie with modifications by Gresley

None have been preserved.

A 7 mm scale kit is available from MSC models.^[7]

In 2023, Sonic Models released a ready-to-run OO scale model in GCR, LNER, and BR variants.^[8]