WiFi NetNews has a nice summary of the state of WiFi on the rails.
In my view railway based WiFi is a great way to preserve the environment. As someone who regularly has taken the train from San Diego to Santa Barbara or L.A. or into SF from Sacramento having an EvDO connection has been a blessing, but with real T1 speeds that WiFi offers the idea of Working Anywhere is the real deal.
It's time for the USA Dept. of Transportation to kick up some dollars and make the rails in heavily congested markets WiFi enabled.