Some further thought has gone into trains formations, timetabling, etc.
I have already done an awful lot of work on a Glasgow-based layout and Perth-based layout (same era, same timetable) so it dawned on me to make proper use of this research.
To this end I've decided that St Catherine's Bay will be timetabled almost exactly the same as Glasgow Buchanan Street, as per the 1964 timetables. Ditto the train formations (helped by my hope to eventually build my Glasgow North