The Peckett OQ Class is a class of

steam locomotive A steam locomotive is a locomotive that provides the force to move itself and other vehicles by means of the expansion of steam. It is fuelled by burning combustible material (usually coal, oil or, rarely, wood) to heat water in the locomot ...

s built in

Bristol Bristol () is a city, ceremonial county and unitary authority in England. Situated on the River Avon, it is bordered by the ceremonial counties of Gloucestershire to the north and Somerset to the south. Bristol is the most populous city in ...

, England by

Peckett & Sons Peckett and Sons was a locomotive manufacturer at the Atlas Locomotive Works on Deep Pit Road between Fishponds and St. George, Bristol, England. Fox, Walker and Company The company began trading in 1864 at the Atlas Engine Works, St. George ...

. Three were built; no. 2124 for

Tower Colliery Tower Colliery ( Welsh: Glofa'r Tŵr) was the oldest continuously working deep-coal mine in the United Kingdom, and possibly the world, until its closure in 2008. It was the last mine of its kind to remain in the South Wales Valleys. It was loca ...

in 1951 and nos. 2150 and 2151 for

Mardy Colliery Maerdy Colliery was a coal mine located in the South Wales village of Maerdy ( cy, Y Maerdy), in the Rhondda Valley, located in the county borough of Rhondda Cynon Taf, and within the historic county boundaries of Glamorgan, Wales. Opened in 187 ...

in 1954. No. 2150 has been preserved and is named ''Mardy Monster''. According to ''

Heritage Railway A heritage railway or heritage railroad (US usage) is a railway operated as living history to re-create or preserve railway scenes of the past. Heritage railways are often old railway lines preserved in a state depicting a period (or periods) i ...

'' magazine it is "Britain’s most powerful industrial locomotive". This claim may be misleading because it is based on

tractive effort As used in mechanical engineering, the term tractive force can either refer to the total traction a vehicle exerts on a surface, or the amount of the total traction that is parallel to the direction of motion. In railway engineering, the term tr ...

rather than

horsepower Horsepower (hp) is a unit of measurement of power, or the rate at which work is done, usually in reference to the output of engines or motors. There are many different standards and types of horsepower. Two common definitions used today are the ...

Preservation

After being withdrawn in 1976, No. 2150 was preserved by the

Swanage Railway The Swanage Railway is a railway branch line from near Wareham, Dorset to Swanage, Dorset, England, opened in 1885 and now operated as a heritage railway. The independent company which built it was amalgamated with the larger London and South ...

in 1979. In 1997 it was purchased by the

Elsecar Heritage Railway The Elsecar Heritage Railway (EHR) is located on the southern part of the former South Yorkshire Railway freight-only branch which ran from Elsecar Junction on its Mexborough to Barnsley Line. The Elsecar Heritage Railway operated an out and b ...

, returning to service in June 2003. It was withdrawn after its boiler certificate expired in 2013. Its overhaul was never completed and it was sold in 2020.Yorkshire Live, 8 July 2020

References

External links

{{commons category-inline 0-6-0ST locomotives OQ Railway locomotives introduced in 1951 Standard gauge steam locomotives of Great Britain