I see your point Alan, re the simplest/most robust/existing engineering solutions [I'm an engineer myself], but since the hurdles to getting the public/gov mindset around to public transport are both huge [and paradoxically small - once its built and everyone tries the damn thing..] surely a new gadget idea in one or 2 locations could spark the public conciousness. Dumb humans love new gizmos - even when TSHTF in 2009.

I grew up in an area of joined up public transport with electric urban rail [not streetcars] and I know the advantages. It is a huge quality of life advantage for the majority of any community.

http://en.wikipedia.org/wiki/Tyne_and_Wear_Passenger_Transport_Executive

http://en.wikipedia.org/wiki/Tyne_and_Wear_Metro

Any public transport is OK with me.

Yes, Tyne & Wear, a KarlsRuhe type of operation (a mix of Urban Rail types) and with the unique "pretzel" line :-)

Consider if some town builds a jPod system. In the first couple of years, breakdowns (including wheelchair bound pax traveling alone) are common, and scheduling software "locks" up periodically.

Costs come out 12 times what was promised, and cracks appear in the lightweight supports (bad welding it turns out), Rust also appears after a few years and it looks like the whole lot will need to be junked in a few more years (Remember that it was all speced to be built for 1/10th the cost of a real transit system).

Has the public benefited ?

Alan