https://www.google.ca/maps/place/Tok...!4d139.6917064
Thats what a truely dense city that can support any level of transit looks like.
https://en.wikipedia.org/wiki/Transp..._Greater_Tokyo
I hope people read the part about their commuter service. The commuter towns that they serve are very dense which is how its supposed to be not like what people are proposing here.