GCR Class 9N

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 4-6-2T UIC class 2′C1′ t Gauge 4 ft 8 1⁄2 in (1,435 mm) standard gauge Driver diameter 5 ft 7 in (1.702 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 Boiler pressure 180 psi (1.24 MPa) Cylinders Two, inside Cylinder size 20 in × 26 in (508 mm × 660 mm)

Performance figures Tractive effort 23,750 lbf (105.6 kN)

Career Operators Great Central Railway, London & North Eastern Railway, British Railways Power class BR: 3MT Axle load class LNER/BR: Route Availability 5 Withdrawn 1942–1961 Disposition All scrapped

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.

Construction and numbering

The GCR built 21 locomotives at Gorton Works in three batches between 1911 and 1917. 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). 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).

Year	GCR Nos.	LNER Nos.	LNER 1946 Nos.
1911	165–170, 23–24, 447–8	5165–70, 5023–4, 5447–8	9800–7, –, 9808
1912	449–452, 128–129	5449–5452, 5128–5129	9809–9814
1917	371–374, 411	5371–5374, 5411	9815–9819
1923	3, 6, 7, 30, 45, 46, 88, 154, 156, 158	5003, 5006, 5007, 5030, 5045, 5046, 5088, 5154, 5156, 5158	9820–9829
1925-26	—	1712/9, 1738, 1750/6, 1760/6/7/8, 1771, 1782/4, 1790	9830–9842

No. 5447 was withdrawn in 1942, because the frames were badly cracked.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

• 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.

Modelling

A 7mm scale kit is available from MSC models.

Further reading

• Ian Allan ABC of British Railways Locomotives, 1948 edition, part 4, page 55.

External links

• The Robinson A5 (GCR Class 9N) Pacific Tank Locomotives
• Steam Loco Class Information: LNER 4-6-2T
• Steam Loco Class Information: LNER 4-6-2T