| LMS 4P Compound 4-4-0 | |
|---|---|
| Power type | Steam |
| Builder | LMS Derby (75) LMS Horwich (20); North British Locomotive Company (25) Vulcan Foundry (75) |
| Build date | 1924–1932 |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Leading wheel diameter |
42.5 in (1,080 mm) |
| Driver diameter | 6 ft 9 in (2.06 m) |
| Wheelbase | Loco: 24.25 ft (7.391 m) |
| Length | 56.65625 ft (17.269 m) |
| Locomotive weight | 61.7 long tons (62.7 t) |
| Tender weight | 41.2–41.7 long tons (41.9–42.4 t) |
| Fuel type | Coal |
| Fuel capacity | 4–5.5 long tons (4.1–5.6 t) |
| Water capacity | 3,500 imp gal (16,000 l) |
| Boiler | G9AS |
| Boiler pressure | 200 psi (1.4 MPa) |
| Firegrate area | 28.5 sq ft (2.65 m2) |
| Heating surface: Tubes |
1,170 sq ft (109 m2) |
| Heating surface: Firebox |
147 sq ft (13.7 m2) |
| Superheater area | 290 sq ft (27 m2) or 272 sq ft (25.3 m2) |
| Cylinders | HP: 1 (inside) LP: 2 (outside) |
| High-pressure cylinder size |
19 × 26 in (480 × 660 mm) |
| Low-pressure cylinder size |
21 × 26 in (530 × 660 mm) |
| Valve gear | Stephenson |
| Tractive effort | 22,650 lbf (100.8 kN) |
| Train brakes | Vacuum |
| Career | London, Midland and Scottish Railway British Railways |
| Class | 4P |
| Number in class | 195 |
| Number | LMS 900–939, 1045–1199 |
| Retired | 1952–1961 |
The London, Midland and Scottish Railway Compound 4-4-0 was a class of steam locomotive designed for passenger work.
Contents |
One hundred and ninety five engines were built by the LMS, adding to the 45 Midland Railway 1000 Class, to which they were almost identical. The most obvious difference is that the driving wheel diameter was reduced from 7' 0" on the Midland locomotive to 6' 9" on the LMS version. They were given the power classification 4P.
The LMS continued the Midland numbering from 1045 to 1199 and then started in the lower block of 900–39. After nationalisation in 1948, BR added 40000 to their numbers so they became 40900–39 and 41045–199.
None has survived to preservation, though the first of the Midland 1000 Class engines has.
For terminology, see Steam locomotive components
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