Midland Railway 483 Class
Midland Railway 483 Class|
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Rebuilt Midland Johnson 2P 4-4-0 No. 40542 at Chesterfield 1959 |
| Type and origin |
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| Power type |
Steam |
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| Designer |
Samuel W. Johnson |
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| Build date |
Midland locos built 1882-1901
S&DJ locos built 1914-1921 |
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| Specifications |
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| Configuration |
4-4-0 |
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| Gauge |
4 ft 8 1⁄2 in (1,435 mm) standard gauge |
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| Driver diameter |
Original, 6 ft 6.5 in (1.994 m)
Rebuilt, 7 ft 0.5 in (2.146 m) |
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| Loco weight |
53 tons 7 cwt |
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| Fuel type |
Coal |
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| Boiler pressure |
160 psi |
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| Cylinders |
Two inside |
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| Cylinder size |
Original, 18 in × 26 in (460 mm × 660 mm)
Rebuilt, 20.5 in × 26 in (520 mm × 660 mm) |
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The Midland Railway 483 Class 4-4-0 was a class of steam locomotive designed by Samuel W. Johnson for passenger work on the Midland Railway. This design formed the basis for the later LMS Class 2P 4-4-0. The London, Midland and Scottish Railway (LMS) seems to have inherited three batches of these locomotives and some of them passed into British Railways (BR) ownership in 1948.
Numbering
- BR numbers 40332-40397 (17 locomotives) originally built 1882-1891, some rebuilt from 1910 onwards
- BR numbers 40400-40562 (143 locomotives) originally built 1891-1901, all rebuilt between 1912 and 1923
- BR numbers 40322-40326 (5 locomotives) built for Somerset and Dorset Joint Railway 1914-1921 and taken into LMS stock in 1930
Note: two of the above number series contain gaps so the totals do not tally.
Rebuilding
On rebuilding, the Stephenson valve gear was retained but the following changes were made:
- 18 in × 26 in (460 mm × 660 mm) cylinders with slide valves were replaced by 20.5 in × 26 in (520 mm × 660 mm) cylinders with piston valves
- 6 ft 6.5 in (1.994 m) driving wheels were replaced by 7 ft 0.5 in (2.146 m) driving wheels
- a superheater was fitted
References
External links
