What's the point of a post like the one above?
Yes, there are schedules for departure from Rapid Transit terminals and, those of us who have spent many hours observing those departures, know that almost all trains depart within a minute or two of the 'advertised'. Delays arise from slow loading and occasionally from a breakdown or other 'event'.
If a train does not arrive in time for departure, it will be late.
When a train is late, it will get a heavier load, this will delay the train even more, delaying arrival and subsequent departures. the only remedy is 'expressing' a train.
LS