Not a brilliant negative but pictures of the class at St Enoch are far from common. I believe there was a Saturday filling in turn to Edinburgh Princes Street which occasionally used a Duchess.

46224 is showing lamps indicating ECS or a parcels. Looking at the train of carriages in the rear right indicates that it is a long parcels train behind 46224. The tower on the right of the photo is one of two of the bridge crossing the Clyde on the approach to St Enoch.