LNER Thompson Class Q1

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, numbered 69925-69937. The sources for the information in the infobox (right) are.[1][2][3]

LNER Thompson Class Q1
Type and origin
Power typeSteam
DesignerEdward Thompson (rebuild)
Rebuild date1942–1945
Number rebuilt13
Specifications
Configuration:
​
 • Whyte0-8-0T
Gauge4 ft 8 1⁄2 in (1,435 mm) standard gauge
Driver dia.4 ft 8 in (1.422 m)
Loco weightQ1/1: 69.9 long tons (71.0 t; 78.3 short tons)
Q1/2: 73.65 long tons (74.83 t; 82.49 short tons)
Fuel typeCoal
Fuel capacityQ1/1: 4.5 long tons (4.6 t; 5.0 short tons)
Q1/2: 4 long tons (4.1 t; 4.5 short tons)
Water capQ1/1: 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 pressure180 psi (1.2 MPa)
CylindersTwo outside
Cylinder size19 in × 26 in (483 mm × 660 mm)
Valve gearStephenson
Performance figures
Tractive effort25,645 lbf (114.07 kN)
Career
Operators
ClassQ1
Power class5F
Withdrawn1954–1959
DispositionAll scrapped

Overview

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

  • Q1/1 (69925-69928) with 1,500-imperial-gallon (6,800 l; 1,800 US gal) tanks
  • Q1/2 (69929-69937) with 2,000-imperial-gallon (9,100 l; 2,400 US gal) tanks

The extra 500 imperial gallons (2,300 l; 600 US gal) of water in the Q1/2 was carried in the rear tank, under the coal bunker, resulting in a reduced coal capacity.

Withdrawal

All the Class Q1 locomotives were withdrawn and scrapped from 1954 to 1959. None have been preserved.

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References
  1. Ian Allan ABC of British Railways Locomotives, part 4 (1948 ed.). p. 56. ISBN 978-0-7110-0401-6.
  2. "The Thompson Q1 0-8-0T Locomotives". The London & North Eastern (LNER) Encyclopedia.
  3. Grafton 2007, pp. 43, 81 & 141.

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

Sources
  • Grafton, Peter (2007). Edward Thompson of the LNER. Usk: Oakwood Press. ISBN 978-0-85361-672-6. OL145.CS1 maint: ref=harv (link)


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