Alexander Allan (locomotive engineer)

Alexander Allan was a Scottish mechanical engineer. He was born at Montrose, Angus, in 1809 and died at Scarborough, Yorkshire on 2 June 1891.[2]

Alexander Allan
Born	1809 Montrose, Angus
Died	2 June 1891 Scarborough, Yorkshire
Nationality	Scottish
Citizenship	British
Occupation	Engineer
Engineering career
Discipline	Mechanical engineering
Institutions	Institution of Mechanical Engineers
Significant design	straight-link valve gear

LNWR No. 3074, Allan's 'Crewe' goods engine designed for the GJR, introduced 1846 [1]

Allan's 2-2-2 Columbine, GJR No. 49, LNWR No. 1868 with cab, built 1845 withdrawn 1902

Allan valve gear, seen here fitted to an early Austrian locomotive

Biography

Alan was born in Montrose, Angus, Scotland in 1809.[3] He undertook a apprenticeship to Mr. Gibb, a millwright.[3] In 1832 aged about 23 he took a position at Robert Stephenson and Company, Newcastle upon Tyne.[3] By 1834 he had moved to Liverpool and taken up a position with George Forrester and Company who were about to begin building railway locomotives.[3]

Allan was works manager for George Forrester and Company until 1840.[4] He was the engineer sent for a year to supervise the maintenance of the three Forrester engines Vauxhall, Dublin and Kingstown for the first year of their service at Dublin and Kingstown Railway in 1834.[5]

From 1843 to 1853 he was Works Manager at the Crewe Works of the Grand Junction Railway, later London and North Western Railway, under Francis Trevithick.[6] He later claimed the credit for designing the Crewe type locomotive with inclined cylinders and double frames, but this claim has been challenged.[7] From 1853 to 1865 he was Locomotive Superintendent of the Scottish Central Railway. Allan was an original member of the Institution of Mechanical Engineers in 1847.

Inventions

Allan made a number of inventions, including a balanced slide valve, but the best-known is his straight-link valve gear of 1855.

See also

• George Forrester and Company
• Locomotives of the London and North Western Railway

References

1. "Steam engine locomotive, built at the Crewe works, for the Grand Junction Railway". flickr. 5 December 2009. Retrieved 29 April 2016.
2. "Alexander Allan and other Crewe locomotive designers". Steamindex.com. 16 September 2008. Retrieved 19 June 2012.
3. Institution of Mechanical Engineers (1891), p. 289.
4. Day and McNeil, Lance and Ian (2002). Biographical Dictionary of the History of Technology (Annotated ed.). Routledge. ISBN 978-1134650194. Retrieved 24 October 2019.
5. Murray (1981), pp. 176–178.
6. LNWR Society (2007), Allan, Alexander.
7. Stuart & Reed (1971).

Sources

• LNWR Society (2007). "LNWRS Glossary". London and North Western Railway Society. Archived from the original on 17 October 2007.CS1 maint: ref=harv (link)
• Institution of Mechanical Engineers (1891). "Proceedings 1891". Institution of Mechanical Engineers. London.CS1 maint: ref=harv (link)
• Lowe, James W. (2014) [1975]. British Steam Locomotives Builders. Pen & Sword Transport. ISBN 978 1 47382 289 4. OCLC 889509628.CS1 maint: ref=harv (link)
• Murray, Kevin (1981). Ireland's First Railway. Dublin: Irish Railway Record Society. ISBN 0-904078-07-8.CS1 maint: ref=harv (link)
• Stuart, D. H.; Reed, Brian (1971). The Crewe Type (Loco Profile No 15).CS1 maint: ref=harv (link)