[Cirrus]

^
That's not remotely true.

Many cities can make due with that level of service, but the larger and denser ones can't. In Washington we have major capacity problems with Metro. There are parts of our system that barely work with 8-car subway. They absolutely would not work with any lesser technology.

We are building light rail now because we already have the trunk subway lines. What we're working on now are the secondary corridors.