LMS Fowler Class 4F
|LMS Fowler Class 4F|
44444 at Stockport, 1950
|Builder||LMS Derby Works
LMS Crewe Works
LMS St. Rollox Works
LMS Horwich Works
North British Locomotive
Kerr, Stuart & Co.
Andrew Barclay & Sons Co.
|Gauge||4 ft 8 1⁄2 in (1,435 mm)|
|Driver diameter||63 in (1.600 m)|
|Length||52 ft 0 1⁄8 in (15.853 m)|
|Locomotive weight||48.75 long tons (49.53 t)|
|Fuel capacity||4 long tons (4.1 t)|
|Water capacity||3,500 imp gal (16,000 l; 4,200 US gal)|
|Boiler||LMS type G7S|
|Boiler pressure||175 psi (1.21 MPa)|
|Firegrate area||21 sq ft (2.0 m2)|
|1,034 sq ft (96.1 m2)|
|– Firebox||124 sq ft (11.5 m2)|
|Superheater area||252 sq ft (23.4 m2) later 246 sq ft (22.9 m2)|
|Cylinder size||20 in × 26 in (510 mm × 660 mm)|
|Valve gear||Stephenson, piston valves|
|Tractive effort||24,555 lbf (109.23 kN)|
|Axle load class||Route Availability 5|
|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 in favour 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. Why this poor design feature was perpetuated is a complete mystery but, unfortunately, the LMS 4F inherited it.
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.
|Numbers||Lot No.||Date built||Built by|
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 They were all withdrawn between 1959 and 1966.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.
|4027||44027||Gloucestershire Warwickshire Railway||Recently transferred from the Midland Railway - Butterley, overhaul now started and making steady progress|
|4123||44123||Avon Valley Railway||Restoration in progress|
|4422||44422||Peak Rail||Stored following a failed boiler examination|
- LMS/BR Power classification, 4F
- Locomotive weight, 48 tons 15 cwt
- Tender weight, 41 tons 4 cwt
- Boiler pressure, 175 psi
- Superheater, Yes
- Cylinders, 20"x26"
- Driving wheel diameter, 5' 3"
- Tractive effort, 24,555 lb (11,138 kg)
- Valve gear, Stephenson (piston valves)
For terminology, see Steam locomotive components
- David Hunt, John Jennison Bob Essery & Fred James LMS Locomotive Profiles No.10: The Standard Class 4 Goods 0-6-0s ISBN 1-905184-35-2 (pictorial supplement ISBN 1-905184-37-9)
- Rowledge, J.W.P (1975). Engines of the LMS, built 1923–51. Oxford: Oxford Publishing Company. ISBN 0-902888-59-5.
- Platforms Souls (Chap.1), Whittaker, Nicholas, Gollancz, London, 1995
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