APR 74 24. An unidentified Class 52 crosses a viaduct between Chacewater and Truro with the 14:40 Penzance-Paddington, April 17 1974
I don't remember exactly where I took this picture, but comparing it with maps and aerial photos it could be the viaduct at a place named Jolly's Bottom a little way east of the main Chacewater viaduct.
It will have left Redruth at 15:13
Taken on April 17, 1974