LSWR 46 Class
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| Type and origin | |
|---|---|
| Power type | Steam |
| Designer | William Adams |
| Builder | Beyer, Peacock & Co. |
| Serial number | 1832–1843 |
| Build date | 1879 |
| Total produced | 12 |
| Specifications | |
|---|---|
| Configuration | Built as 4-4-0T; rebuilt to 4-4-2T |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Leading dia. | 2 ft 6 in (0.762 m) |
| Driver dia. | 5 ft 7 in (1.702 m) |
| Trailing dia. | 3 ft 0 in (0.914 m) |
| Length | 36 ft 5 1⁄2 in (11.11 m) |
| Loco weight | 58.95 long tons (59.90 t) |
| Fuel type | Coal |
| Fuel capacity | 3 long tons (3.0 t) |
| Water cap | 1,650 imp gal (7,500 l; 1,980 US gal) |
| Boiler pressure | 140 psi (0.97 MPa) |
| Cylinders | Two, outside |
| Cylinder size | 18 in × 24 in (457 mm × 610 mm) |
| Performance figures | |
|---|---|
| Tractive effort | 13,810 lbf (61.4 kN) |
| Career | |
|---|---|
| Operators | LSWR · SR |
| Class | 46, later 046 |
| Power class | K |
| Number in class | 1 January 1923: 7 |
| Withdrawn | 1914–1925 |
| Disposition | All scrapped |
The LSWR 46 Class was a class of 4-4-0 passenger tank locomotive designed by William Adams for the London and South Western Railway. None have survived for preservation.
The first design by William Adams, the 12 members of the 46 Class represent an interim design to supplement the Beattie Well Tanks that were already in service. All were built from 1879, and were intended for light suburban passenger traffic around London and the South Coast on the LSWR railway network. They were later rostered on local passenger services under the ownership of the Southern Railway, though none of the class survived into British Railways control. In consequence, none have survived into preservation.
The 46 Class was designed as a response to the requirements of the LSWR to have a range of newer, more reliable locomotives for use on their network. As a result, Adams intended the 46 Class to be an immediate stop-gap measure that could be utilised on passenger services while he devised a better solution to the railway's motive power problem. This solution would eventually prove to be the 415 Class of 4-4-2 locomotive.
The construction of the 46 Class was contracted out by the LSWR in order to speed construction and delivery. The contractor selected was Beyer, Peacock and Company, which manufactured 12 4-4-0 tank locomotives in 1879. After only four years in service, the entire class was eventually converted to the 4-4-2 'radial' tank design between 1883 and 1886, following the successful introduction of the '415' Class in 1882 on London's suburban network.
The reasoning behind the conversion was one of standardization, as various parts could be exchanged between both classes, and in consequence, the only glaringly obvious difference between the two classes, apart from the large side tanks on the 46 class, was the positioning of the safety valves on the boiler. However, the conversion resulted in a heavier locomotive, as an increase in water capacity was incorporated, as was an extended coal bunker to enable longer journeys to be achieved. This entailed the extension of the locomotive's frames, resulting in a longer locomotive than the original 4-4-0 design.
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Wikipedia