Brighton line 150 celebrations and 56037 passes the A27/A23 junction at Mill Road Patcham, enroute to Brighton with 1Z19: 1625 Victoria to Brighton service.
You can no longer get this close to the railway line at this location.
Slide dated 22/9/91.
More details of the specials run that day can be found here:-
http://www.sixbellsjunction.co.uk/90s/910922.htm