Indian locomotive class SP

BESA class SP[1]
Builder's photo of an SP class.
Type and origin Power type Steam Designer British Engineering Standards Association (BESA) Builder Vulcan Foundry North British Locomotive Company Robert Stephenson and Hawthorns Build date SP: 1904 Total produced SP: 10
Specifications Configuration: ​  • Whyte 4-4-0 Gauge 5 ft 6 in (1,676 mm) Driver dia. 6 ft 2 in (1.880 m) Wheelbase 6 ft 0 in (1.829 m) + 7 ft 5 in (2.261 m) + 9 ft 5 in (2.870 m) Axle load 16.25 long tons (16.51 t; 18.20 short tons) Loco weight 51.00 long tons (51.82 t; 57.12 short tons) Tender weight 39.50 long tons (40.13 t; 44.24 short tons) Fuel type Coal Fuel capacity 7.5 long tons (7.6 t; 8.4 short tons) Water cap. 3,000 imp gal (14,000 L; 3,600 US gal) Firebox: ​  • Grate area 25.3 sq ft (2.35 m2) Boiler: ​  • Diameter Outside: 4 ft 8+1⁄2 in (1,435 mm)  • Tube plates 11 ft 4+1⁄4 in (3.46 m)  • Small tubes 1+3⁄4 in (44 mm) × 236 off Boiler pressure 180 lbf/in2 (1.24 MPa) Heating surface: ​  • Firebox 120 sq ft (11 m2)  • Tubes 1,229.5 sq ft (114.22 m2) Cylinders Two, inside Cylinder size 18+1⁄2 in × 26 in (470 mm × 660 mm) Valve gear Stephenson valve gear Valve type Slide valve
Performance figures Tractive effort 11.2 bar boiler pressure: 87 kN 9.3 bar boiler pressure: 72 kN
Career Operators Indian Railways, Eastern Bengal Railway, East Indian Railway Company Oudh and Rohilkhand Railway Locale Eastern Railway zone and Northern Railway zone Disposition At least one preserved in the United Kingdom and another in Pakistan.
References: [2]

The Indian locomotive class SP (Standard Passenger) is a class of Indian 4-4-0 passenger steam locomotives which was built around 1905. It was one of the BESA locomotives developed by the British Engineering Standards Committee, later called the British Engineering Standards Association (BESA).