LNER Class A8
A8 4-6-2T No. 69873 at Middlesbrough Locomotive Depot 1954
|Type and origin|
|Designer||Vincent Raven and Nigel Gresley|
|3 ft 1 1⁄4 in (0.946 m)|
|Driver diameter||5 ft 9 in (1.753 m)|
|3 ft 9 in (1.143 m)|
|Wheelbase||33 ft 3 in (10.13 m)|
|Length||42 ft 6 in (12.95 m)|
|Axle load||17.8 long tons (18.1 t; 19.9 short tons)|
|Locomotive weight||86.8 long tons (88.2 t; 97.2 short tons)|
|Fuel capacity||4 long tons (4.1 t; 4.5 short tons)|
|Water capacity||2,000 imp gal (9,100 l; 2,400 US gal)|
|Boiler||4 ft 9 in (1.45 m)|
|Boiler pressure||175 psi (1.21 MPa)|
|Firegrate area||23 sq ft (2.1 m2)|
|680 sq ft (63 m2)|
|– Flues||280.6 sq ft (26.07 m2)|
|– Total||1,084.6 sq ft (100.76 m2)|
|Superheater area||191.134 sq ft (17.757 m2)|
|Cylinder size||16 1⁄2 in × 26 in (419 mm × 660 mm)|
|Tractive effort||22,940 lbf (102.0 kN)|
|Operator(s)||London and North Eastern Railway, British Railways|
The London and North Eastern Railway (LNER) Class A8 was a type of 4-6-2T steam locomotive, designed by both Vincent Raven and Nigel Gresley. They were rebuilt from the LNER Class H1, a 4-4-4T. In 1931, H1 No. 2162 was rebuilt as a 4-6-2T and given the A8 classification.
After a series of trials throughout the North East Area, all of the remaining H1s were rebuilt as A8 4-6-2Ts between 1933 and 1936. During the process of rebuilding, the boiler was modified to include a Robinson-type superheater rather than the original Schmidt superheater. In 1935, further modifications resulted in the A8 boiler being interchangeable with the A6, A7, A8, H1, and T1 classes.
The rebuilt A8s could easily work the heavy suburban traffic and long distance coastal trains on which they were put to work. They were also welcome replacements for the ageing G5 0-4-4Ts which had been working these services. Allocations of the 45 locomotives were split between the North East / Newcastle area, the Yorkshire Coast Whitby and Scarborough, Hull, and Leeds (Neville Hill).
- Weight: 86 long tons 18 cwt (194,700 lb or 88.3 t)
- Boiler pressure: 175 lbf/in2 (1.21 MPa), superheated
- Cylinders: three, 16.5 by 26 in (419 by 660 mm)
- Driving wheels: 5 ft 9 in (1.753 m)
- Tractive effort: 22,940 lbf (102.0 kN)
- Number sequence in (1957/57) was from 69850 to 69894.
Diesel railcars were rapidly introduced during the 1950s, and the A8s quickly became surplus to requirements. Withdrawals started in 1957, and the A8 was extinct by the end of 1960.
- Willie Yeadon, Yeadon's Register of LNER Locomotives Vol. 21: Class A5 to A8, H1, H2, L1(L3), L2, M1 and M2 tank engines. Booklaw/Railbus, 2001
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