I was also asked why the timetable doesn't feature regular steam to Laverton
Considerable time was spent on this during timetable planning
The problem is that allowing for 20 minutes run round time for the loco, it was just not possible to produce a model that would accommodate three round full line journeys a day. The best was two and a half and achieving that would restrict crew rest periods.
If we reduced train frequency there would be long gaps at stations without trains which wouldn't be popular with visitors who are very complimentary about the integrated DMU service
However, if anyone can make a timetable work please lets us have details