GCR Class 9N

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

GCR Class 9N
LNER Class A5
Marylebone Station geograph-2358841-by-Ben-Brooksbank.jpg
A5/1 No. 9828 outside Marylebone station 1947
Type and origin
Power typeSteam
DesignerJohn G. Robinson
Builder
Serial numberHL: 3616–3628
Build date1911–1926
Total produced44
Specifications
Configuration:
 • Whyte4-6-2T
 • UIC2′C1′ h2t
Gauge4 ft 8 12 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)
Length42 ft 11 78 in (13.103 m)
Loco weightA5/1: 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 typeCoal
Fuel capacity4.15 long tons (4.22 t; 4.65 short tons)
Water cap2,280 imp gal (10,400 l; 2,740 US gal)
Boiler pressure180 psi (1.24 MPa)
CylindersTwo, inside
Cylinder size20 in × 26 in (508 mm × 660 mm)
Valve gearStephenson
Valve type10-inch (254 mm) piston valves
Performance figures
Tractive effort23,750 lbf (105.6 kN)
Career
Operators
Power classBR: 4P, 3P from May 1953
Axle load classLNER/BR: Route Availability 5
Withdrawn1942–1961
DispositionAll 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[edit]

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]

Year GCR Nos. LNER Nos. LNER 1946 Nos.
1911 165–170, 23–24, 447–448 5165–70, 5023–24, 5447–48 9800–07, –, 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 1712/19, 1738, 1750/56,
1760/66–68, 1771,
1782/84, 1790
9830–9842

No. 5447 was withdrawn in 1942, because the frames were badly cracked.[3] In 1943, the others were allocated new numbers in the 9800–42 block, but these were not applied until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.

Table of withdrawals[6]
Year Quantity in
service at
start of year
Quantity
withdrawn
Locomotive numbers
1942 44 1 5447.
1957 43 2 69815/33.
1958 41 23 69802/04/07/10/11/18/19/22/24/26/28/30–32/34–42.
1959 18 8 69800/03/05/09/12/16/25/27.
1960 10 10 69801/06/08/13/14/17/20/21/23/29.

Modelling[edit]

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

References[edit]

  1. ^ a b Fry 1964, p. 4.
  2. ^ a b Fry 1964, pp. 4,7.
  3. ^ Fry 1964, p. 7.
  4. ^ Fry 1964, pp. 4,10–11.
  5. ^ Fry 1964, pp. 8,10–11.
  6. ^ Fry 1964, pp. 10–11.
  7. ^ MSC models GCR/LNER/BR Robinson A5 4-6-2T
  • Fry, E. V., ed. (April 1964). Locomotives of the L.N.E.R., part 7: Tank Engines - Classes A5 to H2. Kenilworth: RCTS. ISBN 0-901115-13-4.

Further reading[edit]

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

External links[edit]