LSWR P14 class
LSWR/SR P14 class
|
|
| Specifications |
Configuration:
|
|
| • Whyte
|
4-6-0 |
| Gauge |
4 ft 8 1⁄2 in (1,435 mm) |
| Leading dia. |
3 ft 7 in (1.092 m) |
|
Driver dia. |
6 ft 0 in (1.829 m) |
| Loco weight |
74 tons 13 cwt (79.8 tonnes) |
| Tender weight |
49 tons 0 cwt (49.8 tonnes) |
| Fuel type |
Coal |
| Fuel capacity |
4 tons (4.1 tonnes) |
| Water cap |
4,500 imp gal (20,000 l) |
| Boiler pressure |
175 psi (1.21 MPa) |
| Cylinders |
4 |
| Cylinder size |
15 × 26 in (381 mm × 660 mm) |
|
|
|
|
|
| Specifications |
Configuration:
|
|
| • Whyte
|
4-6-0 |
| Gauge |
4 ft 8 1⁄2 in (1,435 mm) |
| Leading dia. |
3 ft 7 in (1.092 m) |
|
Driver dia. |
6 ft 0 in (1.829 m) |
| Loco weight |
74 tons 13 cwt (79.8 tonnes) |
| Tender weight |
49 tons 0 cwt (49.8 tonnes) |
| Fuel type |
Coal |
| Fuel capacity |
4 tons (4.1 tonnes) |
| Water cap |
4,500 imp gal (20,000 l) |
| Boiler pressure |
175 psi (1.21 MPa) |
| Cylinders |
4 |
| Cylinder size |
15 × 26 in (381 mm × 660 mm) |
The LSWR P14 class was a class of 4-6-0 locomotive designed by Dugald Drummond for the London and South Western Railway.
The continuing need to grasp the nettle in terms of Drummond's first two 4-6-0 classes meant that he went back to the drawing board to create another design. The LSWR's immediate traffic needs were covered by the relatively successful G14 design of 1908, though with only five locomotives in the class, they were unable to undertake the haulage of all heavy boat train services. However, the problem of continually accelerating timetables to the South Coast ports remained, and the G14s were in dire need of assistance from a new class of similar design.
The design's proven ability to ply their trade at faster speeds, and their inherent larger power-to-weight ratio on other lines meant that Drummond once again decided to persevere with the concept. He also returned to a two-cylinder layout with what was to become the P14 Class.
On his penultimate 4-6-0 design, Drummond had to produce a locomotive that was capable of hauling increased traffic at speed. Once again, the possible advantages of the design presented themselves. A similar boiler to the other classes, rated to 175 lbf/in² saturated steam pressure, was utilised, therefore generating the steam needed to power a four-cylinder front end, which powered 6' wheels. The new design was equipped with four sets of Walschaerts valve gear, therefore reducing the mechanical complexity that had plagued his previous designs. This factor also meant a marginally lighter axle-loading. Large, single splashers were also implemented which covered the wheels, though these would prove troublesome in service. The Drummond 'watercart' eight-wheeled tender was utilised for the long journeys on the LSWR mainline. Full-scale construction was undertaken at Nine Elms, with the first of five P14s being outshopped in 1910, two years after the completion of his G14 design.
After a period of 15 years in both primary and secondary passenger duties, Richard Maunsell, who became Chief Mechanical Engineer of the newly formed Southern Railway in 1923, decided that the class needed to be rebuilt to conform with the general standardization of Southern locomotive classes. The P14s were reduced to kits of parts, which were utilised in creating a further batch of N15 (King Arthur Class) locomotives.
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Wikipedia
