L&YR Class 21

'Pug locomotives" are small steam locomotives which were produced for light shunting work, usually at dockyards, factory sites, steelworks, collieries, and other similar locations. The name is derived from a common term in Scotland for a small industrial shunting engine, typically an 0-4-0 tank engine.
== History ==
This class of engine was based on a small class of three engines built by the Vulcan Foundry for the Lancaster & Yorkshire Railway (L&YR) in 1886. These three were numbered 916-918 by the L&YR and one later became 11200 with the London, Midland and Scottish Railway (LMS) although the number was never applied at it was withdrawn from service in 1925. The other two were withdrawn from service in 1910.
Another fifty-seven of these small saddle tanks were built for the L&YR in batches between 1891 and 1910 by Horwich Works. The wheelbase of these were shortened to 5 ft 9 in, the tank was extended over the smokebox, the cab was enlarged, and the boiler pressure raised to 160psi. 
== Accidents and Incidents ==
On July 5, 1963, one of the driving wheels of locomotive 51232 sheared off at Salford.
== Withdrawal ==
Withdrawals started in 1910 with two going in that year. Four went in the 1920s, 31 in the 1930s; leaving 23 to be withdrawn between 1957 and 1964.
== Preservation ==
Two have survived into preservation while the remainder have been scrapped. L&YR No. 19 (LMS No. 11243 ) and L&YR No. 68 (LMS No. 11218, BR No. 51218) which are both owned by the Lancashire and Yorkshire Railway Trust. 
==Gallery==
File:Pug L&Y 68 (8162372855).jpg
File:190009.jpg
File:L&YR Class 21 No. 51232.jpeg
Category:Steam locomotives
Category:Locomotives
Category:Switcher locomotives
Category:0-4-0 locomotives
Category:0-4-0T locomotives
Category:0-4-0T steam locomotives
Category:0-4-0 steam locomotives
Category:United Kingdom
Category:Tank locomotives
Category:Colliery locomotives
Category:L&YR
Category:Lancashire and Yorkshire Railway
Category:LYR Locomotives
Category:LMS locomotives
Category:Horwich Works locomotives
Category:Standard gauge locomotives
Category:Standard gauge steam locomotives of Great Britain
Category:Vulcan Foundry locomotives