On the turntable at Grantham Loco is class O2 large freight locomotive No.63940. These engines became known to the men as 'Tangos' because they gave their crew a rather lively ride on the footplate. At Grantham the O2s were mainly used for hauling heavy trains of ironstone from the mines and quarries around Colsterworth and Stainby to steelworks at Scunthorpe and elsewhere.
In the right background is the tank of the water softening plant, which removed scale-forming minerals from the local water before it was supplied to locomotives. This improved the efficiency and prolonged the life of the boilers. A reserve of coal is stacked in the heap beyond the locomotive.
Photograph lent by Peter Wilkinson.