1. You want the train to carry your vehicle and expect it to price compete with an airline which does not?
2. Doesn't government funding of air traffic control and airport construction count as a subsidy?
BTW I once heard from a railroad employee that there was a train on the east coast that carries personal vehicles to Florida. I don't know if it is still running.
http://www.amtrak.com/servlet/ContentServer?pagename=Amtrak/am2Route/Vertical_Route_Page&c=am2Route&cid=1081256321200&ssid=136