[Cirrus]

APTA numbers are routinely different from local sources, but they're supposedly apples-to-apples nationwide, so when listing agencies I'd use APTA over other sources.

ardecila: I do think that a combination of urban light rail and high quality, frequent commuter rail (more like interurban rail) is capable of handling tremendous densities. However, that sort of system is drastically different than the type of light-rail-as-mini-metro advocated on the last page. Light rail as mini metro has serious flaws, including major capacity constraints. It is fundamentally not capable of doing the same thing as a real Metro. A combination of appropriate modes on appropriate corridors, however, can be capable.