The commentary doubles as a synopsis, and is reproduced below:

At Cowdenbeath, there's a central workshop employing 750 men. It serves nearly 40 collieries in the Fife coalfields, providing facilities that none of their own workshops could afford.

A coal cutter comes in from Lumphinnens for overhaul. Plenty of spare parts cut out unnecessary delays, so collieries don't grudge the time spent on a quick run-over. This prevents overworking machines and reduces breakdowns.

Repairs aren't Cowdenbeath's only job. This winding drum, 19 feet in diameter, is being made for Glencraig. These men, and many others in the workshops, come of mining families. They know what a breakdown at the pit means, so there's no lack of co-operation between colliery and workshop.

At Balgonie, an electric motor has failed. While repairs take place, the workshop's 'flying squad' goes into action. Within a few minutes of getting the call, a spare is on the way, and the work goes on.