OQ Peckett

The OQ Peckett is a class of 0-6-0ST steam locomotives built in Bristol, England, by Peckett and Sons. Three locomotives were built, no. 2124 for Tower Colliery in 1951 and nos. 2150 and 2151 for Mardy Colliery in 1954. No. 2150 has been preserved and is named "Mardy Monster". According to Heritage Railway magazine it is "Britain’s most powerful industrial locomotive". This claim may be misleading because it is based on tractive effort rather than horsepower.