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The track would not run along the ground. You'd want to get height as quickly as possible to minimize atmosphere and track length.

Originating somewhere around Mojave and launching towards Las Vegas could work.

Alternatively, you may want to launch over the ocean for safety reasons, but it seems like you may be subject to more weather concerns.

You don't want to run the track along the ground? Where then, on a dirigible at the mesopause as suggested in http://postbiota.org/pipermail/tt/2011-August/009613.html?

Bouyant structures could be used, as well as wings, to suspend the track.

You can't run along the ground because you don't want to go too fast through atmosphere.