This is a Westbound or "down" working approaching the summit of Hemerdon Bank with 4975 "Umberslade Hall" in charge .
The coaches have roofboards in position , and my old shedbook tells me that 4975 had been allocated to Hereford a few years earlier than the date shown here so if she was still there now this could be a " North to West " duty as they were routed via Hereford. How nicely trimmed back are the embankments , and that's the Southern fringes of Dartmoor on the skyline