If a train is a couple of miles long then you might still need to go a long way out of your way to get to the footbridge.
If a train is a couple of miles long then you might need several bridges
Ftfy
Or the train not stopping there for several hours.
@JonD started
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If a train is a couple of miles long then you might still need to go a long way out of your way to get to the footbridge.