Indian locomotive class SP

Last updated
BESA class SP [1]
ISR NWR SP Beyer Peacock Works 1904.jpg
Builder's photo of an SP class.
Type and origin
Power typeSteam
DesignerBritish Engineering Standards Association (BESA)
Builder
Build dateSP: 1904
Total producedSP: 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 weight51.00 long tons (51.82 t; 57.12 short tons)
Tender weight39.50 long tons (40.13 t; 44.24 short tons)
Fuel type Coal
Fuel capacity7.5 long tons (7.6 t; 8.4 short tons)
Water cap.3,000 imp gal (14,000 L; 3,600 US gal)
Firebox:
  Grate area25.3 sq ft (2.35 m2)
Boiler:
  DiameterOutside: 4 ft 8+12 in (1,435 mm)
  Tube plates11 ft 4+14 in (3.46 m)
  Small tubes1+34 in (44 mm) × 236 off
Boiler pressure180 lbf/in2 (1.24 MPa)
Heating surface:
  Firebox120 sq ft (11 m2)
  Tubes1,229.5 sq ft (114.22 m2)
Cylinders Two, inside
Cylinder size 18+12 in × 26 in (470 mm × 660 mm)
Valve gear Rotary Lentz 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
Locale Eastern Railway zone and Northern Railway zone
DispositionAt least one preserved in the United Kingdom.

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).

Contents

History

The SP class was catalogued in the first edition (1903) of the BESA report on standard locomotives for the railways of the British Raj. 4-4-0 (American) locomotives were preferred in India as they had good riding qualities, even on poor track conditions.[ citation needed ] The SP class used the same boiler as the SG class standard goods locomotives, which had a diameter of 4 feet 8+14 inches (1,429 mm). In the 1910 BESA report, a variant with a larger boiler was developed, which had a diameter of 5 feet 1+14 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 referred to them as the SP class. Beyer Peacock delivered 10 locomotives to the North Western Railway (NWR), which operated lines around the modern-day border of India and Pakistan. [3]

Design

The locomotives were designed with two cylinders, a Belpaire firebox, and used saturated steam. The grate was arranged between two driving wheels. Between the frames were the two cylinders and the Walschaerts valve gear. A small pilot was fitted to the locomotive's buffer beam. The cab was completely enclosed, with the cab's rear wall being formed by the tender.

Pakistan Railway SPS 3157 preserved in the Museum of Science and Industry (MOSI), Manchester Pakistan Railways 3157, MOSI.jpg
Pakistan Railway SPS 3157 preserved in the Museum of Science and Industry (MOSI), Manchester

A later version was designed 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 Pakistan Railways under road number 3157, 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 class.

See also

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References

  1. "SG". Archived from the original on 6 January 2012. Retrieved 1 December 2013.
  2. "Third report of the Locomotive Committee on Standard Locomotives for Indian railways". Indian Industries and Power. March 1910. p. 275. Retrieved 2020-08-31.
  3. Shearsmith, Jan (2017-09-21). "Pakistan Railways Engine No. S/PS 3157, Part One: Production". Museum of Science and Industry Blog. Manchester: Museum of Science and Industry (MOSI) . Retrieved 2020-08-25.