How about taking the 24 hours out, use 5 minutes instead, substitute "no sooner" for "no later", and make it arriving at the station and seeing how it sounds.No. That is "No sooner."
Remember, this is Amtrak which uses "government speak," not plain English.
"Passengers should arrive at the station no sooner than than 5 minutes before the train's departure time."
Versus
"Passengers should arrive at the station no later than 5 minutes before the trains departure time."
It may be just be me, but I think the first would lead to a lot if people missing their trains.
Note I used 5 minutes as an extreme to demonstrate my point. Amtrak's actually guidance is 30 minutes before departure if not checking bags.
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