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SG is the name of a class of Indian steam locomotives used for freight trains. In the designation stands S for Standard, G for Goods. It was by number of built locomotives one of the largest steam locomotive classes built in United Kingdom. The design originated from a BESA standard.
With the growing demand for locomotives in the British Raj it became for the British industry more and more difficult to deliver the required amount. To speed up delivery the British Engineering Standards Association (BESA) was chartered to develop standard locomotive types. The first BESA report issued in 1903 contained a design recommendation for a 4-4-0 standard passenger locomotive called SP and one for a 0-6-0 standard goods locomotive called SG. Revised versions proposed eight classes of broad gauge locomotives and four classes of meter gauge locomotives for various services. These locomotives were later called BESA locomotives. [2]
The SG class was used by the North Western State Railway (NWR), the Eastern Bengal Railway (EBR), the East Indian Railway (EIR) and the Oudh and Rohilkhand Railway (ORR) in India, not only in front of goods trains, but also often in front of passenger trains. They could haul 1450 tons of freight with a speed of 18 mph (29 km/h). Some locomotives were in service in India until the early 1980s and in Pakistan until the 1990s. [3]
A later built variant with Schmidt superheater was called class SGS, where the designation stands for 'Standard Goods Locomotive, Superheated'. Compared to the saturated steam version, the locomotives received larger cylinders with piston valves and larger boilers, as well as a four-axle tender with bogies. [3]
Locomotives delivered as SG class, which were later converted to superheated locomotives were allocated to the class SGC, where the C stands for 'converted'. The class SGSC, later called SGC2, had round fireboxes instead of the Belpaire firebox of the initial version. SGC3 class locomotives were not only retrofitted with superheaters and but received also a Lentz rotary valve gear. [3]
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 for hauling passenger and mail trains frequently. [3]
There was also a class SG1 with unknown characteristics. [3]
| Designation | Number | Year of construction (Rebuilding) | Comments | Divisions |
|---|---|---|---|---|
| SG | 486 | 1905–1913 | Original variant, Belpaire boilers, saturated | NWR EBR |
| SG1 | 66 | |||
| SGC, SGC1 | (ab 1927) | Converted SG locomotives with superheater | NWR | |
| SGS | 362 | Superheater ex works | NWR | |
| SGSC, SGC2 | Round top boiler, superheated | |||
| SGC3 | Superheated, Lentz valve gear | EIR |
| Working | Class | Number | Location | Built | Zone | Builders | Build No | Name |
|---|---|---|---|---|---|---|---|---|
| No | SGC-2 | Saidpur Works, Bangladesh | 1921 | BW | Vulcan Foundry | 240 | ||
Under the Whyte notation for the classification of steam locomotives, 4-6-2 represents the wheel arrangement of four leading wheels on two axles, six powered and coupled driving wheels on three axles and two trailing wheels on one axle. The 4-6-2 locomotive became almost globally known as a Pacific type.
Under the Whyte notation for the classification of steam locomotives, 4-8-2 represents the wheel arrangement of four leading wheels, eight powered and coupled driving wheels and two trailing wheels. This type of steam locomotive is commonly known as the Mountain type.
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The North Eastern Railway (NER) Class P3, classified J27 by the LNER, is a class of 0-6-0 steam locomotive. The P3 Class was designed by Wilson Worsdell and was a relatively minor modification of the existing North Eastern Railway Class P2. The most significant change was a deeper firebox with shallower sloping fire grate. This was achieved by raising the boiler slightly, and by reducing the clearance between the firebox and the rear axle. The P3 Class were a freight engine by nature and used for hauling long trains of freight.
The New South Wales C36 class was a class of two-cylinder, simple, non-condensing, coal-fired superheated, 4-6-0 express passenger steam locomotives built by Eveleigh Railway Workshops and Clyde Engineering for the New South Wales Government Railways in Australia.
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The South African Railways Class 14B 4-8-2 of 1915 was a steam locomotive.
The South African Railways Class 12A 4-8-2 of 1919 was a steam locomotive.
The South African Railways Class 10C 4-6-2 of 1910 was a steam locomotive from the pre-Union era in Transvaal.
The South African Railways Class 10B 4-6-2 of 1910 was a steam locomotive from the pre-Union era in Transvaal.
The South African Railways Class 10A 4-6-2 of 1910 was a steam locomotive from the pre-Union era in Transvaal.
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The Caledonian Railway 721 Class was a class of 4-4-0 steam locomotives designed by John F. McIntosh for the Caledonian Railway (CR) and introduced in 1896. All survived to be absorbed by the London, Midland and Scottish Railway (LMS) in 1923 and a few survived into British Railways (BR) ownership in 1948.
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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.
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