Midland Railway 1000 Class
|Midland Railway 1000 Class|
1025 in photographic grey livery
|Designer||Samuel Waite Johnson: renewed as superheated Deeley compound by Henry Fowler|
|UIC classification||2′B h3v|
|Gauge||4 ft 8 1⁄2 in (1,435 mm)|
|3 ft 6 1⁄2 in (1.080 m)|
|Driver diameter||7 ft 0 in (2.134 m)|
|Boiler||2631–2635 and 1000–1004: G8½
All rebuilt with G9AS
|Boiler pressure||220 psi (1.52 MPa)|
|Cylinders||Three, one inside high-pressure, two outside low-pressure|
|19 in × 26 in (483 mm × 660 mm)|
|21 in × 26 in (533 mm × 660 mm)|
|Valve type||HP: piston valve,
LP: slide valves
|Tractive effort||21,840 lbf (97.1 kN)|
|Railroad(s)||MR → LMS → BR|
These were developed from a series of five locomotives (2631–2635), introduced in 1902 by Samuel W. Johnson, which had had a 3-cylinder compound arrangement on the Smith system. This had a layout of one high pressure cylinder inside the frames, and two low pressure cylinders outside, and utilised Smith's starting arrangement. On the first two locomotives, independent control of high-pressure and low-pressure valve gears was available. From 1905 onwards, Johnson's successor Richard Deeley built an enlarged and simplified version, eliminating all the Smith refinements whilst fitting his own starting arrangement, making the engines simpler to drive. These locomotives were originally numbered 1000–1029, but in the 1907 renumbering scheme the five Smith/Johnson locomotives became 1000–1004 and the Deeley compounds 1005–1034, ten more of these being added in 1908–1909. The original Johnson locomotives were all subsequently renewed as Deeley compounds, including the now-preserved 1000 which was rebuilt and outshopped with a superheater in 1914.
No. 1000 was set aside for preservation after withdrawal and restored in 1959 close to its 1914 condition, painted in Midland maroon livery, running enthusiasts' specials until placed in the temporary Clapham Transport museum. Though steamed since preservation, it is currently a static exhibit at the Scottish Railway Preservation Society at Bo'ness, having been lent by the National Railway Museum in York.
For terminology, see Steam locomotive components
LMS compound locomotives
Other compound locomotives with the same 3-cylinder layout
- Nord 3.101 (renumbered 3.395 in 1909) mixed traffic 2-6-0 prototype built 1887 by the French Chemins de Fer du Nord to the design of Edouard Sauvage - withdrawn in 1929
- NER Class 3CC number 1619 of the North Eastern Railway 4-4-0 express locomotive rebuilt in 1898 from a 2-cylinder compound. This was W.M. Smith's first application of his patent compound system.
- Four Robinson 4-4-2 Atlantic locomotives, classes 8D and 8E, built 1905–1906 as Smith compounds for the British Great Central Railway.
- One 4-6-2 locomotive (No. 900) built by the North British Locomotive Company for the Cape Government Railway in South Africa.
- Five 4-4-0 locomotives (GNRI Class V) designed by G.T Glover and built in 1932 for the Great Northern Railway (Ireland). These used the Deeley starting arrangement.
- André Chapelon's 4-8-4 SNCF 242 A 1
- Ian Allan ABC of British Railways Locomotives, 1948 Edition, part 3, pp 5–6
- Baxter, Bertram (1982). Baxter, David, ed. British Locomotive Catalogue 1825–1923, Volume 3A: Midland Railway and its constituent companies. Ashbourne, Derbyshire: Moorland Publishing Company. pp. 133, 175–176.
- Nock O.S. (1964), "The Midland Compounds"; David & Charles, Dawlish, U.K.
- van Riemsdijk, John (1994). Compound Locomotives. Penryn, UK: Atlantic Transport Publishers. - Relevant pages: 25-32.
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