SR Q1 class

SR Q1 class[1]
Bulleid Q1 0-6-0 at Feltham, 1947
Type and origin Power type Steam Designer Oliver Bulleid Builder SR Brighton Works (20) SR Ashford Works (20) Build date 1942 Total produced 40
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 54 ft 10.5 in (16.73 m) Loco weight 51 long tons 5 cwt (114,800 lb or 52.1 t) Tender weight 38 long tons 0 cwt (85,100 lb or 38.6 t) Total weight 89 long tons 5 cwt (199,900 lb or 90.7 t) Fuel type Coal Fuel capacity 5 long tons 0 cwt (11,200 lb or 5.1 t) 5.1 t; 5.6 short tons Water cap. 3,700 imp gal (16,800 L; 4,440 US gal) Firebox: ​  • Grate area 27 sq ft (2.51 m2) Boiler pressure 230 lbf/in2 (1.59 MPa) Heating surface: ​  • Firebox 170 sq ft (15.79 m2)  • Tubes and flues 1,302 sq ft (120.96 m2)  • Total surface 1,472 sq ft (136.75 m2) Superheater: ​  • Heating area 218 sq ft (20.25 m2) Cylinders Two, inside Cylinder size 19 in × 26 in (483 mm × 660 mm) Valve gear Stephenson Valve type Piston, outside admission Valve travel 6+1⁄8 in (155.58 mm) Valve lap 1+5⁄8 in (41.28 mm)
Performance figures Tractive effort 30,080 lbf (133.80 kN)
Career Operators Southern Railway → British Railways Class SR: Q1 Power class BR: 5FA (later 5F) Numbers SR: C1 – C40 BR: 33001–33040 Nicknames Coffee Pots Charlies Ugly Ducklings Locale Southern Region Withdrawn 1963–1966 Preserved C1 Current owner National Railway Museum Disposition One preserved, remainder scrapped

The SR Q1 class is a type of austerity steam locomotive constructed during the Second World War. The class was designed by Oliver Bulleid for use on the intensive freight turns experienced during wartime on the Southern Railway network. A total of 40 locomotives were built. Bulleid incorporated many innovations and weight-saving concepts to produce a highly functional design. The class lasted in service until July 1966, and the first member of the class, number C1, has been preserved by the National Railway Museum.

The highly unusual and controversial design represents the ultimate development of the British 0-6-0 freight engine, capable of hauling trains that were usually allocated to much larger locomotives on other railways. Nicknames for the class included "Ugly Ducklings", "Coffee Pots",^[2] "Charlies", "Biscuit Tins", "Biscuit Barrels", "Clockworks" and "Frankensteins".^[3]