LMS Fowler 4F
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44444 at Stockport, 1950
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| Type and origin | |
|---|---|
| Power type | Steam |
| Designer | Henry Fowler |
| Builder |
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| Build date | 1924–1941 |
| Total produced | 575 |
| Specifications | |
|---|---|
| Configuration: |
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| • Whyte | 0-6-0 |
| • UIC | C h2 |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) standard gauge |
| Driver dia. | 5 ft 3 in (1.600 m) |
| Length | 52 ft 0 1⁄8 in (15.853 m) |
| Loco weight | 48.75 long tons (49.53 t; 54.60 short tons) |
| Tender weight | 41.20 long tons (41.86 t; 46.14 short tons) |
| Fuel type | Coal |
| Fuel capacity | 4 long tons (4.1 t; 4.5 short tons) |
| Water cap | 3,500 imp gal (16,000 l; 4,200 US gal) |
| Firebox: • Firegrate area |
21 sq ft (2.0 m2) |
| Boiler | LMS type G7S |
| Boiler pressure | 175 lbf/in2 (1.21 MPa) |
| Heating surface: • Tubes and flues |
1,034 sq ft (96.1 m2) |
| • Firebox | 124 sq ft (11.5 m2) |
| Superheater: |
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| • Heating area | 252 sq ft (23.4 m2) later 246 sq ft (22.9 m2) |
| Cylinders | Two, inside |
| Cylinder size | 20 in × 26 in (508 mm × 660 mm) |
| Valve gear | Stephenson |
| Valve type | piston valves |
| Performance figures | |
|---|---|
| Tractive effort | 24,555 lbf (109.23 kN) |
| Career | |
|---|---|
| Operators | |
| Power class | 4F |
| Axle load class | BR: Route Availability 5 |
| Withdrawn | 1959–1966 |
| Disposition | 3 Preserved, remainder scrapped |
The London Midland and Scottish Railway (LMS) Fowler 4F is a class of 0-6-0 steam locomotive designed for medium freight work. They represent the ultimate development of Midland Railway's six coupled tender engines. Many trainspotters knew them as "Duck Sixes", a nickname derived from their wheel arrangement.
The 4F was based on the 197-strong Midland Railway 3835 Class of 1911, with only a few modifications, primarily the adoption of left-hand drive instead of right-hand drive. They originally had been designed by Henry Fowler, who from 1925 became CME of the LMS.
Midland Railway locomotives were notorious for their short axle-box bearings, which were prone to overheating. This design feature was perpetuated in the LMS 4F. The problem was eventually solved with the fitting of mechanical lubricators.
The LMS constructed 530 of the locomotives between 1923 and 1928, numbered sequentially from where the Midland engines left off from 4027. A further 45 examples were reluctantly authorised by William Stanier in 1937 at the behest of the operating department.
The missing numbers (4)4557–61 relate to five locomotives built for the Somerset and Dorset Joint Railway to the Midland Railway 3835 Class design in 1922, and taken into LMS stock in 1930.
All entered British Railways stock in 1948. BR added 40000 to their numbers. They were all withdrawn between 1959 and 1966.
Withdrawals from stock occurred between 1959 and 1966.
Three LMS-built 4Fs survive, with the first-built LMS 4F No. (4)4027 is part of the National Railway Collection. In addition, one Midland 4F, No. (4)3924 has also survived.
The 4F has been modelled by Lima (O, OO, HO and N Gauge) and Graham Farish (N Gauge, still produced under the Bachmann label). Airfix produced a tender drive model of the 4F in OO Gauge in 1978. Production of this was continued by Dapol after it acquired Airfix models in 1985, and were subsequently sold to Hornby in the late 1990s. They upgraded the model to loco drive in 2012. Bachmann have produced a version of the Midland railway variant of the 4F since 2012.
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Wikipedia