[bluGill]

individual transport vs shared is a matter of compromise. Human drivers only go fast (when there is no congestion the autobahn with no speed limit doesn't in practice move any faster than US freeways for the majority of users of each). Trains today have the ability to go faster than human drivers. Trains carry far more people than cars. Thus replacing most trips with train trips would be faster and cheaper for most people.

Note that I said most trips there. If you don't have a system useful enough that most people use it most of the time then people still need cars to get around and that changes the calculation. it can be very hard to get there.