Re: ballistic subterranean trains

From: Party of Citizens (
Date: Thu Sep 27 2001 - 17:03:17 MDT

On Wed, 26 Sep 2001, Spike Jones wrote:

> Nowthen, since we are talking about frictionless evacuated tunnels,
> an acceptable solution would be to build the tunnels at a constant
> depth of about 4.5 km. Such could theoretically be built. After
> the car descends to that depth, regardless of the shape of the
> path down there under these assumptions, it would be travelling
> at about 300 meters/sec, so the trip from anywhere to anywhere
> would be at speed about competitive with current airline travel.

Mag lev trains now travel > 300 mph. How fast would they travel in a
vacuum tube? Why 4.5 km deep? Why not on the surface?


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