66506 Crewe Regeneration passes Uffington on 15 July 2019 with the 6A15 03:54 Whatley Quarry to Appleford Mendip Rail stone hoppers. The edge of a large mass of cloud can be seen in the background. During the short time I was at this location, it had appeared from nowhere in the east, and moved right across to the west, eliminating any chance of the forecast sunny morning!