A downward trend in British coal-mining productivity was reversed between the world wars. Declining productivity before 1914 was accompanied by wide regional differences, especially at the coalface. Scotland attained the best overall. productivity, while coalface productivity was highest in Durham and Northumberland. Regional differences narrowed by the 1920s but re-emerged in the 1930s, as mines in the North Midlands outpaced the productivity gains made elsewhere. Only a multifaceted interpretation can explain these distinctive patterns—over time, between regions, and at different stages of the coal-mining operation.