Indian locomotive class SG

Indian locomotive standard goods class (SG) was a designed locomotive classification used in India that defined certain types of steam-powered freight train. The trains under the scope of this category were typically British locomotives that operated until the end of the Indian steam era. Initially used to haul mail trains, SG-class locomotives were designed in 1903, and had similar components to 4-4-0 locomotives. Allowing for a future increase in boiler size, it was the first 0-6-0 design according to new BESA standards. Efficient and useful, they were built in large numbers and could haul 1450 tons of freight.[2]

SG[1]
Type and origin
Power typeSteam
DesignerBritish Engineering Standards Association (BESA)
BuilderVulcan Foundry, North British Locomotive Company and Robert Stephenson and Hawthorns
Build dateSG: 1905-13 and SGC3:After 1927
Total producedSG: 486 and SG1: 66
Rebuild dateAfter 1927
Specifications
Configuration:
​
 • Whyte0-6-0
Gauge5 ft 6 in (1,676 mm)
Driver dia.61.5 in (1.562 m)
Wheelbase15 ft 3 in (4.65 m)
Axle load16 long tons (16 t; 18 short tons)
Loco weight48 long tons (49 t; 54 short tons)
Tender weight39.25 long tons (39.88 t; 43.96 short tons)
Fuel typeCoal
Fuel capacity7.5 long tons (7.6 t; 8.4 short tons)
Water cap3,000 imp gal (14,000 l; 3,600 US gal)
Firebox:
 • Firegrate area		25.3 sq ft (2.35 m2)
Boiler54 in × 11 in (1,372 mm × 279 mm)
Boiler pressure180 psi (1.24 MPa)
Heating surface:
 • Tubes		1,229.5 sq ft (114.22 m2)
 • Firebox120 sq ft (11 m2)
CylindersTwo, inside
Cylinder size18.5 in × 26 in (470 mm × 660 mm)
Valve gearRotary Lentz valve gear
Valve typeSlide valve
Performance figures
Maximum speed
  • Freight: 18 mph (29 km/h)
  • Troop trains: 30 mph (48 km/h)
Career
OperatorsIndian Railways, Eastern Bengal Railway, EIR and Oudh and Rohilkhand Railway
LocaleEastern Railway zone and Northern Railway zone
DispositionScrapped

Technical variants

3rd class standard goods converted locomotives (SGC3) were retrofitted with super-heaters and were the only locomotive in the world to use the Lentz rotary valve gear with inside cylinders.

The 2nd class of standard goods converted locomotives, abbreviated as SGSC and later as SGC2, was another variant distinguished by round fireboxes. Despite its classification, they were used to haul passenger and mail trains frequently.

There was also a 1st class of standard goods locomotives (SG1).

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See also

References
  1. "SG". Archived from the original on 6 January 2012. Retrieved 1 December 2013.
  2. "IRFCA".


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