Sans Pareil

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This article is about the early steam locomotive. For other uses, see Sans Pareil (disambiguation).
Sans Pareil
Sans Pareil - geograph.org.uk - 2532040.jpg
The original locomotive preserved at Shildon Railway museum
Specifications
Power type Steam
Builder William Hedley and Timothy Hackworth
Configuration 0-4-0
Driver diameter 54 in (1.37 m)
Locomotive weight 4.25 long tons (4.32 t)
Fuel type Coal
Cylinders 2
Cylinder size 7 in × 18 in (180 mm × 460 mm)
Career
Railroad(s) Liverpool and Manchester Railway,
Bolton and Leigh Railway

Sans Pareil is a steam locomotive built by Timothy Hackworth which took part in the 1829 Rainhill Trials on the Liverpool and Manchester Railway, held to select a builder of locomotives. The name means, roughly, 'Without equal' in French.

Drawing of Sans Pareil from 1829

While a capable locomotive for the day, its technology was somewhat antiquated compared to George and Robert Stephenson's Rocket, the winner of the Rainhill Trials and the £500 prize money. Instead of the fire tube boiler of Rocket, Sans Pareil had a double return flue. To increase the heating surface area, the two flues were joined by a U shaped tube at the forward end of the boiler; the firebox and chimney were both positioned at the rear same end, one on either side.

Sans Pareil had two cylinders, mounted vertically at the opposite end to the chimney, and driving one pair of driving wheels directly - the other pair were driven via connecting rods, in the typical steam locomotive fashion.

At the Rainhill Trials, Sans Pareil was excluded from the prize because it was slightly over the maximum permitted weight.[1] Nevertheless it performed very well but had a strange rolling gait due to its vertical cylinders. The 'blast' from the blastpipe was, in Hackworth's trademark style, very strong, so most of the coke was expelled out of the chimney unburnt; and it was this more than its antiquated design that caused its abysmal fuel economy[citation needed]. It was pulled out of the competition because of a cracked cylinder: the design thickness for the cylinder walls was some 1 34 inches (44 mm), but at the point of failure, it was found to be a mere 58 inch (16 mm). Hackworth's supporters cried 'foul!', but as he had had over twenty cylinders cast, choosing the best two for the locomotive, skulduggery on the part of the Stephensons whose firm cast the cylinders, and who were direct competitors at Rainhill, is unlikely. After the trials, the Liverpool and Manchester Railway bought Sans Pareil as well as Rocket. It was subsequently leased to the Bolton and Leigh Railway where it ran until 1844. It was then used as a stationary boiler at the Coppull Colliery, Chorley until 1863,[1] thereafter Sans Pareil was restored and presented to the Patent Office Museum (what became the Science Museum) in 1864 by John Hick. The engine now resides at the Shildon Locomotion Museum on static display.


Replica[edit]

Working replica of Sans Pareil making demonstration runs at the Museum of Science and Industry (Manchester)

A replica locomotive built in 1980 is now preserved by the National Railway Museum at its new Shildon Locomotion Museum annex, also home to what remains of the original locomotive.

Other locomotives[edit]

London, Midland and Scottish Railway Royal Scot Class 4-6-0 locomotive 6126 was originally named Sans Pareil. This loco was built by the North British Locomotive Company at Glasgow in September 1927 and withdrawn in October 1963 as 46126 Royal Army Service Corps. An AL6 electric locomotive built in Doncaster in 1965, number E3106 (later numbered 86214) carried the name 'Sans Pareil' between 1981 and 2005. 86214 was scrapped in 2006.

See also[edit]

External links[edit]

References[edit]

  1. ^ a b Casserley, H.C. (1976). Preserved locomotives (4th ed.). London: Ian Allan. p. 17. ISBN 071100725X.