[AnimalMuppet]

I'm pretty sure that the rail is more expensive... until you start paying for the gas for all the cars. Railroads kill highways on energy efficiency.

If the cars are electric, I'm less sure.

[nightski]

Not to mention cars going 150 MPH. I can't imagine the fuel expenditure for that kind of commute. Efficiency starts dropping dramatically at 55+.

[sbov]

Or wear and tear. I doubt car parts are built with sustained speeds of 150 MPH in mind.