SR Q class

SR Q class[1]
30541 at Guildford shed, 1963
Type and origin Power type Steam Designer Richard Maunsell Builder SR Eastleigh Works Build date 1938–1939 Total produced 20
Specifications Configuration: ​  • Whyte 0-6-0  • UIC C h2 Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Driver dia. 5 ft 1 in (1.549 m) Length 53 ft 9+1⁄2 in (16.40 m) Width 8 ft 4 in (2.54 m) Height 12 ft 10 in (3.91 m) Loco weight 49 long tons 10 cwt (110,900 lb or 50.3 t) (55 short tons) Tender weight 40 long tons 10 cwt (90,700 lb or 41.1 t) (45 short tons) Total weight 90 long tons 0 cwt (201,600 lb or 91.4 t) (101 short tons) Fuel type Coal Fuel capacity 5 long tons (5.1 tonnes; 5.6 short tons) Water cap. 3,500 or 4,000 imp gal (15,900 or 18,200 L; 4,200 or 4,800 US gal) Boiler pressure 200 lbf/in2 (13.79 bar; 1.38 MPa) Cylinders Two, inside Cylinder size 19 in × 26 in (483 mm × 660 mm)
Performance figures Tractive effort 26,160 lbf (116.37 kN)
Career Operators Southern Railway → British Railways Class SR: Q Power class BR: 4F Numbers SR: 530–549 BR: 30530–30549 Locale Southern Region Withdrawn 1962–1965 Disposition One preserved, remainder scrapped

The Q Class is a type of 0-6-0 steam locomotive designed by Richard Maunsell of the Southern Railway and constructed immediately prior to the Second World War for use on medium-distance freight trains throughout the network. Twenty locomotives were built by Maunsell's successor, Oliver Bulleid, in 1938. The design was relatively old-fashioned and the class was soon afterwards eclipsed by Bulleid's own more powerful Q1 class. Nevertheless the locomotives performed adequately and reliably on the tasks for which they had been designed, until their withdrawal in 1965. Only one has survived, and is preserved on the Bluebell Railway.