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There are rules in place to equalise trains stopping races though. ie. the break and peloton getting restarted with the same time gaps. Also, this situation makes much more of a difference when the race is only 6hr long vs. days and there's drafting involved.
I'm talking more about navigational choices ruining your race result, say choosing the ferry and they cancel it for the day or riding a road around the ferry that has been washed away when your opponent uses the ferry.
Or if this happened to you in a race: