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 at Gorton Works. All passed to British Railways in 1948, numbered 69925–69937.^[1][2][3]

LNER Thompson Class Q1
Type and origin Power type Steam Designer Edward Thompson (rebuild) Rebuild date 1942–1945 Number rebuilt 13
Specifications Configuration: ​  • Whyte 0-8-0T Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Driver dia. 4 ft 8 in (1.422 m) Loco weight Q1/1: 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 type Coal Fuel capacity Q1/1: 4.5 long tons (4.6 t; 5.0 short tons) Q1/2: 4 long tons (4.1 t; 4.5 short tons) Water cap. 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 (483 mm × 660 mm) Valve gear Stephenson
Performance figures Tractive effort 25,645 lbf (114.07 kN)
Career Operators London and North Eastern Railway → British Railways Class Q1 Power class 5F Withdrawn 1954–1959 Disposition All scrapped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All the Class Q1 locomotives were withdrawn and scrapped from 1954 to 1959.