LNER Thompson Class O1

LNER Thompson Class O1

No. 63786, rebuilt from ex-GC Class O4 No. 6515 at Killamarsh 1963

Type and origin Power type Steam Designer Edward Thompson Builder LNER Build date 1944 Total produced 58

Specifications Configuration 2-8-0 UIC class 1'D Gauge 4 ft 8 ^1⁄2 in (1,435 mm) standard gauge Driver diameter 4 ft 8 in (1.422 m) Loco weight 73.3 long tons (74.5 t; 82.1 short tons) Fuel type Coal Boiler pressure 225 psi (1.55 MPa) Cylinders Two, outside Cylinder size 20 in × 26 in (508 mm × 660 mm)

Performance figures Tractive effort 35,520 lbf (158.0 kN)

Career Power class 8F Axle load class Route Availability 6 Disposition All scrapped

The London and North Eastern Railway (LNER) Thompson Class O1 was a class of 2-8-0 steam locomotive designed by Edward Thompson for freight work. None have survived to preservation.

Construction

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.^[1] 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.

British Railways

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.^[2]

Preservation

None of the Thompson O1s have been secured for preservation.

Models

Hornby make models of the O1s in OO gauge.

63760 at Gorton loco shed on 8 November 1958. This O1 is unusual in being fitted with two air pumps just in front of the cab for operation of heavy iron ore trains from Tyne Dock to Consett steel works.

References

1. Rowledge, J.W.P. (1977). Heavy Goods Engines of the War Department, Volume 1, ROD 2-8-0. Springmead Railway Books. pp. 66–68.
2. Ian Allan (Summer 1961). ABC of British Railways Locomotives, part 4. pp. 36–37.

External links

• LNER encyclopedia
• Railuk database