LMS Coronation 4-6-2 No 46232 Duchess of Montrose on the 'Royal Scot' near Floriston on 6 April 1959. I suspect this is the down service, taken late afternoon, as the sun angle is correct, whereas it would be pretty well head on for the up train near Floriston.

Photo: D.M.C. Hepburne-Scott / Rail Archive Stephenson