[vidarh]

To add to that:

Some London tube lines run with <100 second headway, and the highest capacity London underground trains have a capacity of nearly 1200

And my local heavy rail station regularly handles 3-4 trains to the same station in a 10 minute interval. E.g right now there are 3 trains for London Victoria scheduled to leave in a 7 minute period, and that's not peak time.