Alan, I agree completely with you but have decided after seeing that PRT website that the issue is psychological rather than rational.
I think that many uhmerikans have a deep seated fear of strangers and "the other" that would have to be overcome to actually get on the communal compartment of a light rail system.
Maybe we should figure out a light rail pod system for the agoraphobics who fear coming in contact with strangers. Something like this PRT system but the pod could be attached to a light rail communal vehicle. It would be individually isolated and could be disinfected and sprayed with new car scent after each use. Or if you are really upscale, you could have your own personal tricked out pod. Definitely put surcharge on their use... Now, I'm sounding as crazy as the PRT people but I promise you, that fear and loathing of the stranger is probably the greatest impediment to light rail.
Cheers

fear and loathing of the stranger is probably the greatest impediment to light rail

Quite probably true. One of the end results of social isolation endemic to the suburbs.

My response, perhaps inadequate, is to build the systems that people want NOW ! (or rather wanted in 2003 before the oil price climb) and see who wants more after we get Phase I going.

http://www.lightrailnow.org/features/f_lrt_2007-04a.htm

Best Hopes,

Alan