LNER Thompson Class Q1

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LNER Thompson Class Q1
Type and origin
Power type Steam
Designer Edward Thompson (rebuild)
Rebuild date 1942–1945
Number rebuilt 13
Configuration 0-8-0T
Gauge 4 ft 8 12 in (1,435 mm)
Driver diameter 4 ft 8 in (1.42 m)
Locomotive weight Q1/1: 69.9 long tons (71.0 t)
Q1/2: 73.65 long tons (74.83 t)
Fuel type Coal
Fuel capacity Q1/1: 4.5 long tons (4.6 t)
Q1/2: 4 long tons (4.1 t)
Water capacity Q1/1: 1,500 imp gal (6,800 l; 1,800 US gal)
Q1/2: 2,000 imp gal (9,100 l; 2,400 US gal)
Boiler pressure 180 psi (1.2 MPa)
Cylinders Two outside
Cylinder size 19 in × 26 in (480 mm × 660 mm)
Valve gear Stephenson
Performance figures
Tractive effort 25,645 lbf (114.07 kN)
Class Q1
Withdrawn 1954–59
Disposition All scrapped

The London and North Eastern Railway (LNER) Thompson Class Q1 was a class of 0-8-0T steam locomotives. They were rebuilds of the GCR Class 8A (LNER Class Q4) 0-8-0s. Thirteen were rebuilt between 1942 and 1945. All passed to British Railways in 1948 and they were numbered 69925-69937. The sources for the information in the infobox (right) are.[1][2]


The locomotives had outside cylinders with inside valves and inside Stephenson valve gear. There were two variants:

  • Q1/1 (69925-69928) with 1,500 gallon tanks
  • Q1/2 (69929-69937) with 2,000 gallon tanks

The extra 500 gallons of water in the Q1/2 was carried in the rear tank, under the coal bunker, resulting in a smaller coal capacity.


Withdrawn from 1954-9. None were preserved.

Further reading[edit]

  • Willie Yeadon Yeadon's Register of LNER locomotives Vol 20: Class Q1, Q2, Q3 & Q4, & The Q1 Tank


  1. ^ Ian Allan ABC of British Railways Locomotives, part 4 (1948 ed.). p. 56. 
  2. ^ "The Thompson Q1 0-8-0T Locomotives". The London & North Eastern (LNER) Encyclopedia.