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The Indian Railways SP class is a class of Indian steam locomotives used for passenger trains which was built around 1905. In the designation SP stands for Standard Passenger. The design originated from a BESA standard.

Indian Railways SP[1]
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 0-6-0 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:  • Firegrate 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:  • Tubes 1,229.5 sq ft (114.22 m2)  • Firebox 120 sq ft (11 m2) Cylinders Two, inside Cylinder size 18+1⁄2 in × 26 in (470 mm × 660 mm) Valve gear Rotary Lentz valve gear Valve type Slide valve
Performance figures Maximum speed Freight: 18 mph (29 km/h) Troop trains: 30 mph (48 km/h)
Career Operators Indian Railways, Eastern Bengal Railway, East Indian Railway Company Oudh and Rohilkhand Railway Locale Eastern Railway zone and Northern Railway zone Disposition Scrapped

History

The standard SP series for passenger transport was presented in the first edition of the 1903 BESA standard. The 4-4-0 ("American") wheel arrangement with a leading bogie has already proven itself in India because it shows good smoothness even in poor track conditions. The SP series used the same boiler as the SG class standard goods locomotives, which had a diameter of 4 feet 8+1⁄4 inches (1,429 mm). In the 1910 BESA standard, a variant with a larger boiler was proposed, which had a diameter of 5 feet 1+1⁄4 inches (1,556 mm), as used in the PT class passenger tank locomotives.[2]

The locomotives were delivered to different railways, but only the Indian States Railways (ISR) operated railways used the type designation SP. Beyer-Peacock delivered a series of 10 pieces to the North Western Railway (NWR), whose route network lay in today's border area of India and Pakistan.[3]

Design

The locomotive was a two-cylinder saturated engine design with a Belpaire firebox. The grate was arranged between the coupled wheel sets. Between the frames were the two cylinders and the Walschaerts valve gear. A small cowcatcher was attached to the from buffer beam. The cab was completely enclosed, with the cab rear wall being formed by the three-axle tender.

A later version was created equipped with a superheater and designated SPS (Standard Passenger, Superheated); SP locomotives retro-fitted with superheaters were usually reclassified as SPC (Standard Passenger, Converted) An SPS locomotive, most recently operated by the Pakistan Railways is preserved in the Museum of Science and Industry (MOSI) in Manchester. The exterior of the locomotive is practically identical to that of the SP series.

See also

• Indian Railways
• Rail transport in India#History
• Locomotives of India
• Rail transport in India

References

• Hughes, Hugh (1990). Indian Locomotives: Part 1 – Broad Gauge 1851–1940. Harrow, Middlesex: The Continental Railway Circle. ISBN 0-9503469-8-5. OCLC 21871114.

На других языках

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[de] IR-Klasse SP

Die Baureihe SP war eine breitspurige Schlepptender-Dampflokomotive für den Reisezugverkehr auf den Bahnen in Britisch-Indien, die um 1905 gebaut wurde. Sie gehört zu den BESA-Lokomotiven, die vom British Engineering Standards Committee, später British Engineering Standards Association (BESA) genannt, entwickelt wurden. Das Kürzel SP steht für Standard Passenger (Locomotive).

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- [en] Indian locomotive class SP

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