The BR Standard Class 4 2-6-0 is a class of steam locomotive

Steam locomotive

A steam locomotive is a railway locomotive that produces its power through a steam engine. These locomotives are fueled by burning some combustible material, usually coal, wood or oil, to produce steam in a boiler, which drives the steam engine...

 designed by Robert Riddles

Robert Riddles

Robert Arthur "Robin" Riddles, CBE, MIMechE, MinstLE was a British locomotive engineer.-LNWR and LMS:Riddles was born in 1892 and entered the Crewe Works of the London and North Western Railway as a premium apprentice in 1909, completing his apprenticeship in 1913...

 for British Railways (BR). 115 locomotives were built.
The class was designed at the ex-LNER works at Doncaster

Doncaster Works

Doncaster railway works is in the town of Doncaster, South Yorkshire, England.Always referred to as "the Plant", it was established by the Great Northern Railway in 1853, replacing the previous works in Boston and Peterborough...

 which was also responsible for building 25 of the 115-strong class. The remaining 90 were split between Horwich

Horwich Works

Horwich Works was a railway works built in 1886 by the Lancashire and Yorkshire Railway in Horwich, near Bolton, in the North West of England when the company moved from its original works at Miles Platting, Manchester.-Buildings:...

 and Derby Works

Derby Works

The Midland Railway Locomotive Works, known locally as "the loco" comprised a number of British manufacturing facilities in Derby building locomotives and, initially, rolling stock in Derby, UK.-Early days:...

.

The last in the series, No.76114, was also the final steam engine to be constructed at the 'Plant' (as Doncaster works was known).