Dr. Jarrett Walker's (PhD, Stanford, Humanities) major factors that determine transit ridership:
* Density
* Walkability
* Linearity
* Proximity
The technology of the vehicle isn't mentioned.
This is kind of insane for a city that really didn’t have rail until 2009
Parker “Austin Needs Approval Voting” Welch
I'm catching plenty of reader comments that say "What about New York?" "What about Chicago and Washington, D.C.?" A little known subtlety, found in the National Transit Database, tells us that metro Seattle transit use is slightly more per capita than Chicago, and similar totals to Philly.