Imagine a high-speed rail line that could get you from San Francisco to LA in 2 hours and 40 minutes. That dream appears to be coming true, thanks to work by the California High-Speed Rail Authority.
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California Building 220 MPH High-Speed Train from San Francisco to LA : Gas 2.0

Solar-Powered Interstate Traveler Hydrogen Super Railway
The Interstate Traveler is developing a solar and hydrogen powered MagLev light rail transportation system that will use zero emissions.

A Case for rail in Los Angeles
L.A.'s a huge sprawling city with only a fledgling rail system. Traffic's worsening, yet rail still has some strong opponents who'd rather see the money go to more buses. FredCamino of MetroRiderLA makes an impassioned case for bringing a full-fledged rail system to Los Angeles. Find out about the politics and the debates behind L.A.'s mass transit (or lack thereof) dilemma.

Interactive map of proposed US maglev trains
Solution to the gridlock that plagues America's roads and skies? If only these could get built, we could catch up with Europe and Asia in terms of transit.