LSWR T14 class
T14 No. 443 at Vauxhall 1948
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| Type and origin | |
|---|---|
| Power type | Steam |
| Designer | Dugald Drummond |
| Builder | LSWR Eastleigh Works |
| Build date | 1911–12 |
| Total produced | 10 |
| Specifications | |
|---|---|
| Configuration | 4-6-0 |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Leading dia. | 43 in (1.092 m) |
| Driver dia. | 79 in (2.007 m) |
| Length | 65 ft 6.25 in (19.97 m) |
| Loco weight | 76.50 long tons (77.7 t) |
| Fuel type | Coal |
| Fuel capacity | 5 long tons (5.1 t) |
| Water cap | 5,800 imp gal (26,000 l) |
| Boiler pressure | 200 psi (1.38 MPa) (saturated); 175 psi (1.21 MPa) (superheated) |
| Cylinders | Four |
| Cylinder size | 15 × 26 in (381 660 mm) |
| Valve gear | Walschaerts |
| Performance figures | |
|---|---|
| Tractive effort | 25,177 lbf (111.99 kN) (saturated) |
| Career | |
|---|---|
| Operators | London and South Western Railway, Southern Railway, Southern Region of British Railways |
| Class | LSWR: T14 SR: T14 BR:T14, power group: 4P |
| Nicknames | Paddleboxes or Paddleboats |
| Locale | Great Britain |
| Retired | 1940, 1948–1951 |
| Disposition | All scrapped |
The LSWR Class T14 was a class of ten 4-6-0 locomotives designed by Dugald Drummond for express passenger use on the London and South Western Railway and constructed at Eastleigh in 1911–12.
Dugald Drummond's success with his previous 4-4-0 designs created a new problem. His new and robust designs allowed the timetables to be accelerated, and it soon became clear that faster passenger locomotives with a large of power-to-weight ratio were needed. This was especially true when the LSWR's passenger requirements were increasing with lengthened, heavier rolling stock that needed to keep up with faster point-to-point schedules.
However, Drummond knew that this could only be achieved via the use of the 4-6-0 wheel arrangement and a multiple-cylinder layout. He had already introduced the F13, E14, G14 and P14 as new classes of 4-6-0, but they had all fallen significantly short of keeping pace with the demands made of them.
Despite his track record, Drummond decided to return to the 4-6-0 wheel arrangement. This was because such a design had been proven on other railways such as the Great Central, and the additional traction provided by an extra pair of driving wheels was useful in starting heavy trains. The resultant design, class T14, incorporated many features seen previously on his other 4-6-0 designs, the Drummond lipped chimney, large splashers. However, driving wheel diameter was increased by seven inches to 6' 7", and these were powered by four cylinders set in line in an arrangement similar to German practice in the first years of the 20th century. Divided drive was retained with the inside cylinders driving the front axle whilst the outside ones propelled the second axle. Steam distribution was by two sets of Walschaerts valve gear on the outside, the motion of the inside valves being derived through rockers. Six locomotives (447 and 458—62) were fitted with Drummond's smokebox superheater, the other four used saturated steam.
However, despite more consideration over the failings of his previous designs, the class was still plagued by the liabilities of heavy coal and water consumption combined with the serious ongoing ailment of hot axle boxes that afflicted all his previous 4-6-0s.
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