After reading Ebbie's post my immediate thought was. "How could you possibly keep volcanic steam hot for an 800 mile journey?" Then it occurred to me that a pipeline made of an inner pipe of highly temperature resistant material encased inside an outer pipe, with a vacuum between the two could work. It would basically be something akin to a high-temperature Thermos bottle, only 800 miles long.

If it works, maybe we could do the same thing with all the hot air in Washington D.C.