LNER Thompson Class O1
|LNER Thompson Class O1|
No. 63786, rebuilt from ex-GC Class O4 No. 6515 at Killamarsh 1963
|Type and origin|
|Gauge||4 ft 8 1⁄2 in (1,435 mm)|
|Driver diameter||4 ft 8 in (1.42 m)|
|Locomotive weight||73.3 long tons (74.5 t)|
|Boiler pressure||225 psi (1.55 MPa)|
|Cylinder size||20 in × 26 in (510 mm × 660 mm)|
|Tractive effort||35,520 lbf (158.0 kN)|
|Axle load class||Route Availability 6|
Because of wartime restrictions on new-build locomotives, they were rebuilds of LNER Class O4 "ROD" 2-8-0s built before and during World War I, although most of the locomotive was replaced during this rebuild. The first LNER rebuild took place in February 1944, and 58 locomotives were rebuilt to class O1 in total, with the last being locomotive 63856 in October 1949 during the early British Railways era, after which the programme was halted. The main modification to the original Great Central Railway Class 8K design was the incorporation of a standard LNER 100A boiler, Walschaerts valve gear and new cylinders.
The locomotives passed to British Railways (BR) Eastern and North Eastern Regions on 1 January 1948 and were given BR running numbers in the range 63570-63920. However, this range included many unrebuilt O4s.
None of the Thompson O1s have been secured for preservation.
Hornby make models of the O1s in OO gauge.
- Rowledge, J.W.P. (1977). Heavy Goods Engines of the War Department, Volume 1, ROD 2-8-0. Springmead Railway Books. pp. 66–68.
- Ian Allan (Summer 1961). ABC of British Railways Locomotives, part 4. pp. 36–37.
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