This topic amuses me for a couple of reasons… OK, I volunteer on a tramway rather than a railway, but we always run a 15-minute (on the hours, the quarters and the halves) or 20-minute (hours, twenties, forties) frequency through the day. These frequencies are advised to visitors and are necessitated by the two single-line sections forming part of the route, where staffs (tokens) are used to control movements.
Each day we have a “Duty Inspector” (DI) who is in overall charge of the operation. Some of them are very good - they ensure the departures are on time as much as possible. Others seem to take a somewhat more lackadaisical attitude and would seemingly rather chat with the crews or customers than get vehicles away on time. We also have customers who seem to think we are just playing with trams and can run when we (or more accurately they) like. And insist we wait for the proverbial Aunt Mabel while she goes to the toilet, or just take their own sweet time while telling us it doesn’t matter because its not a proper tramway. Actually, an odd minute or two delay doesn’t matter too much, but more can do. But occasionally customers get rude when we tell them we can’t wait any longer and need to depart, no matter how politely we explain why and despite the next departure never being more than 15/20 minutes hence.
The crux of the timeliness issue for us is that a late departure delays another vehicle’s return due to the interaction with the single-line sections. If one leaves late, another almost inevitably has to wait somewhere part way back along the line - seemingly for no reason in some customer’s views, leaving the hapless crew to explain the delay. So most of us try our best to stick to the orchestrated plan / timetable, and if we do things usually run smoothly. Personally I really dislike being late for anything (in my own life), so I usually try to keep to time when operating vintage trams. But things can be rather frustrating sometimes, especially when DIs don’t seem to care and we have to explain to customers why we are standing on a seemingly unoccupied line going no where.