In the second of his two programmes looking at machinery working in Britain's surface coal mines, Steven Vale supplies plenty of information about the machines in his script, narrated by David Holt. There’s Britain’s biggest hydraulic excavator, excavator Caterpillar and Liebherr excavator. Other highlights include a 340-tonne O&K RH170 and an old 480-tonne O&K RH 200 loading Cat 789 trucks.