[markus92]

Your capacity drops dramatically, by at least an order of magnitude if not more. The Jubilee line can do 30 trains per hour, 875 people per train is 26250 people per hour. Say an average minibus can hold 26 people, you'll literally need a thousand busses an hour to move everyone. And yes it all runs at capacity especially during rush hour.

[aglavine]

Lets call them buses instead of minibuses and each one has the same capacity of a wagon.

Instead of 10 formations of 6 wagons you have 60 buses.

You have same capacity and one third of traveling time per ride.