I really like the idea that street cars, trains and subways could share a single network (kinda like they do in Tokyo, except Tokyo doesn't really have street c

I really like the idea that street cars, trains and subways could share a single network (kinda like they do in Tokyo, except Tokyo doesn't really have street cars, mostly trains - https://www.youtube.com/watch?v=0KMYAEIXVzA https://www.youtube.com/watch?v=0KMYAEIXVzA). It would allow trains to come from one direction, pass through the city undisturbed and emerge on the other side and continue.