> They are not as nice though. Ha! Apparently you haven't used Northern in the UK. Nice! (chuckle) I don't think it's really about nicety, but about capacity.

> They are not as nice though. Ha! Apparently you haven't used Northern in the UK. Nice! (chuckle) I don't think it's really about nicety, but about capacity. A subway train can carry up to 1'000 passengers, depending on length and construction. You can have frequencies of a train every 90 seconds (example: line C in Prague, during rush hour). So you can transport up to 40'000 people per hour in each direction. Buses, while certainly much better than private vehicles, can never match that capacity. Alas, they're much cheaper and certainly more flexible.