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They don't just drive a train to the station and hope they can park it somewhere. They timetable this sort of shit and publish it.
For example, the 7:48 always departs from platform 1 and is the first train that gets split from 8 down to 4 coaches. Happens every night. If I get away in time, that's the train I will be on. Bikeless. If I manage to get that train I will try and catch you up because I am so awesomely quick.
Citymapper will give you the platform number up to an hour before departure. That's why you often see people standing on a platform with no train listed on the overhead display for that platform.
#localknowledge