To be honest I was being rather general. I know TOCs like TPX have had '30 second rules' in place for some time which were included in their timetables, but again these are intercity services and you would expect passengers for long distance to be definitely on time, like a flight. But local commuting trains are different, like buses, you look at the time on the board, and expect it to not go any earlier than this. But as already stated, the true disgrams will be slightly different and will allow for extra time.
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