BR 5MT 4-6-0 No 73077 and a black five with the 1pm Mallaig-Glasgow in March 1956.
This is leaving Crianlarich southbound on the short 1 in 66 up to the 35¾ mile post (seen on the left) with with the minor summit gradient post also on the left.

Photo: W.J. Verden Anderson / Rail Archive Stephenson