LSWR Class S11
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LSWR 395
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| Type and origin | |
|---|---|
| Power type | Steam |
| Designer | Dugald Drummond |
| Builder | LSWR Nine Elms Works |
| Build date | 1903 |
| Total produced | 10 |
| Specifications | |
|---|---|
| Configuration: |
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| • Whyte | 4-4-0 |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Leading dia. | 3 ft 7 in (1.092 m) |
| Driver dia. | 6 ft 1 in (1.854 m) |
| Length | 63 ft 9 in (19.43 m) |
| Total weight | 86 long tons (87.4 t) |
| Fuel type | Coal |
| Fuel capacity | 5 tons (5.1 tonnes) |
| Water cap | 4,000 imp gal (18,000 l) |
| Boiler pressure | 175 psi (1.21 MPa) |
| Cylinders | Two, inside |
| Cylinder size | 19 × 26 in (483 × 660 mm) |
| Valve gear | Stephenson |
| Performance figures | |
|---|---|
| Tractive effort | 19,126 lbf (85.08 kN) |
| Career | |
|---|---|
| Operators | London and South Western Railway, Southern Railway, Southern Region of British Railways |
| Class | LSWR / SR: S11 BR: 2P, later 3P |
| Locale | Great Britain |
| Retired | 1951–1954 |
| Disposition | All scrapped |
The LSWR Class S11 was a class of 10 4-4-0 steam locomotives designed for express passenger work by Dugald Drummond. They were introduced to services on the London and South Western Railway in 1903. None of the class survived into preservation after their brief career in British Railways ownership.
The problem of uniting both power and traction in a compact express passenger locomotive design had taxed the Locomotive Superintendents of the LSWR for many years.Joseph Beattie was the first to establish the LSWR's policy of using smaller wheeled locomotives to handle these steep gradients.
Dugald Drummond attempted to grasp the nettle by utilising his new T9 class over the arduous route. It soon became clear that despite the merits of the T9s for fast running on the various express passenger services to the west of England, the large wheels of the class were not suited for the task in hand. A new design of locomotive was needed that incorporated the desired improvements to enable fast running on gradients.
Drummond took the decision to construct a new class of ten 4-4-0s especially for this part of the LSWR network. The class was to incorporate the same frames as the T9, though smaller 6 feet 1 inch (1.854 m) driving wheels were substituted, whilst they also had balanced crank axles. The boiler was also of 5 feet (1.52 m) diameter, another feature that was different from the T9s, capped off with a dome and stovepipe chimney. Production began at Nine Elms in 1903, and had ended by the end of the year with a total of ten locomotives. All locomotives were fitted with the Drummond "watercart" eight-wheel tender for longer running on the LSWR network.
The locomotive was fitted with cross-water tubes fitted into the firebox, as featured on the T9 class, although feedwater tubes were not fitted. This was an attempt to increase the heat surface area of the water, which was achieved, though at a cost in boiler complexity. All ten were superheated between 1920 and 1922 by Robert Urie after took over from Drummond.
Under the LSWR, the class was outshopped in the LSWR Passenger Sage Green livery with purple-brown edging, creating panels of green. This was further lined in white and black with 'LSWR' in gilt on the tender tank sides.
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Wikipedia