SR Z class

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SR Z class[1][page needed]
BR Z class 30951 at Exeter Central, 1960
Type and origin Power type Steam Designer Richard Maunsell Builder SR Brighton Works Build date 1929 Total produced 8
Specifications Configuration: ​  • Whyte 0-8-0T  • UIC D n3tG Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Driver dia. 4 ft 8 in (1.422 m) Length 39 ft 4 in (11.99 m) Loco weight 71 long tons 12 cwt (160,400 lb or 72.7 t) 72.7 t; 80.2 short tons Fuel type Coal Fuel capacity 3 long tons 0 cwt (6,700 lb or 3 t) 3.0 t; 3.4 short tons Water cap. 1,500 imp gal (6,800 L; 1,800 US gal) Firebox: ​  • Grate area 18.6 square feet (1.73 m2) Boiler pressure 180 psi (1.24 MPa) Cylinders 3 Cylinder size 16 in × 28 in (406 mm × 711 mm)
Performance figures Tractive effort 29,376 lbf (130.67 kN)
Career Operators Southern Railway → British Railways Class SR: Z Power class BR: 7F Numbers SR: 950–957 BR: 30950–30957 Withdrawn 1962 Disposition All scrapped

The SR Z class was an 0-8-0T 3-cylinder tank engine designed by Richard Maunsell and intended for heavy shunting on the Southern Railway, the first eight entering into service in 1929. It was a successful design and would have been built in greater numbers, but an order for a further ten was cancelled in 1930 due to the reduction in freight traffic as a result of the Great Depression.