Heres a further image of my layout 'Bawdsey' with a Class 15 locomotive on passenger duties. This would be pretty rare as the locomotives didn't have the facility to provide steam heating to the passenger cars, and would rarely have been on passenger rosters, least of all in winter. The model is 4mm/ft scale and depicts the late 1950's early 60's which was our main steam to diesel transition era.
There are further details of Bawdsey here if you're interested. http://bawdsey.wordpress.com/ and also of one of my other layouts and modelling projects here http://albionyard.wordpress.com/