Steve
It's a shot looking across a crowded goods yard towards the station platform. It was originally a commercial postcard but has been copied and sold by Lens of Sutton. I suspect it is out of copyright being something like 100 years old so, when I can find it I will post a scan on here. Might take a day or two....
As a general rule I suspect most of the coal for merchants in the Calne area cam from the FoD and Cannock coalfields, but I can't quote you chapter and verse on that.