66.516 passed the site of the closed Savernake station with 6V76, the 14:39 Acton T.C. to Whatley Quarry stone empties, on 26 April 2021. Savernake is the summit of the line and the point where it crosses the watershed. To the east, water drains into the Kennet and then the Thames, to the west it's in the catchment of the Hampshire Avon to Patney and then the Bristol Avon.