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Midland Railway 483 Class
Rebuilt Midland Johnson 2P 4-4-0 No. 40542 at Chesterfield 1959
Type and origin
Power type
Steam
Designer
Samuel W. Johnson
Build date
Midland locos built 1882-1901 S&DJ locos built 1914-1921
Specifications
Configuration:
• Whyte
4-4-0
Gauge
4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.
Original, 6 ft 6.5 in (1.994 m) Rebuilt, 7 ft 0.5 in (2.146 m)
Loco weight
53 tons 7 cwt
Fuel type
Coal
Boiler pressure
160 psi
Cylinders
Two inside
Cylinder size
Original, 18 in × 26 in (460 mm × 660 mm) Rebuilt, 20.5 in × 26 in (520 mm × 660 mm)
Performance figures
Tractive effort
Original: 15,960 lbf Rebuilt: 17,585 lbf
Career
Power class
LMS 2P
Withdrawn
1950-1959
Disposition
All scrapped
The Midland Railway 483 Class 4-4-0 was a class of steam-driven locomotive designed by Henry Fowler for passenger work on the Midland Railway. The class were nominally "rebuilds" of various earlier classes designed by Samuel W. Johnson, although the '483' class engines were, unquestionably, 'accountancy rebuilds' (effectively new locos 'disguised' to gain routine expenditure approval from the board).[1] This design formed the basis for the later LMS Class 2P 4-4-0.
Construction of the first batch of this class was authorised by Midland Railway Order O/3942 dated 21 June 1911: 'Please put your work in hand in connection with rebuilding engines 483–522 with new frames, new cylinders and G7 boilers fitted with Schmidt's superheaters.' Apart from the savings made by using the parts that were salvaged from the old engines, there was an added benefit in referring to them as rebuilt since the royalties due to the superheater company were lower for modified locomotives than for new ones.[2] This first batch of locomotives previously formed the 150 class. Their rebuilding to Class 483 took place 1912-1913.
Four more batches of rebuilds were authorised; in 1912, 1913, 1914 and 1922. The London, Midland and Scottish Railway (LMS) inherited these locomotives at the Grouping of the railways in 1923, completing the last of these rebuilds in 1924.
Some of them duly passed into British Railways (BR) ownership in 1948.
^Essery, R.J.; Jenkinson, D. (1988). An Illustrated Review of Midland Locomotives, volume 2. Wild Swan Publications. p. 139. ISBN 0 906867 59 2.
^Hunt, David; Essery, Bob; James, Fred (2000). Midland Engines No. 3 – The Class 2 superheated 4-4-0s ('483' class rebuilds). Didcot: Wild Swan Publications. p. 7. ISBN 1 874103 60 7.
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