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>It will definitely have some sort of tracks. They've shown demos of a Model X on tracks in their demo tunnel. The website linked specifically says that it wil

>It will definitely have some sort of tracks. They've shown demos of a Model X on tracks in their demo tunnel. The website linked specifically says that it will not have tracks. The concrete itself acts as the 'guide' for the skates without needing any type of other tracks (such as traditional metal train tracks). >The project will also have to deliver on the same demands wrt. fire suppression as any other tunnel. This is also address by the website. Fire suppression isn't needed because the tunnel is made only of concrete. There is no concern about other materials (asphalt, high-voltage electrical, etc) catching on fire. >The station building iself must be sized according to the number of people per hour, not the train length; the physical platforms that you use to step on/off trains on subways typically extend into the tunnels. I'm not sure what you mean. Train stations are definitely sized according to train lengths. In my hometown, a significant roadblock to expanding our public train system is that we started off with short trains (and short stations to match), and it is very expensive to extend the length of the stations now that we use longer trains.

semi-extrinsic 8y ago
So they may not have metal tracks, but they will be limited to similar turning radii as a subway line just to maintain passenger comfort going at 120 mph. No trains travelling faster than 60 mph are limited in turning radius by mechanical properties. Wrt. fire suppression: Tesla can state whatever they want, but they will either have to fulfill the demands set forth in NFPA 502 for fire suppression in tunnels, or they will never be allowed to open to the public. Civil engineering is very strict on these things, for a very good reason. For an underground train, you can have the train platform extend well beyond the actual station building. If you've ever taken the subway/tube in NY or London or similar you know what I mean. If not, look e.g. at this Google Maps of the Gloucester Road tube stop: https://goo.gl/maps/KQwuSz6RCUE2 https://goo.gl/maps/KQwuSz6RCUE2 The station building is the small square labeled Gloucester Road tube stop. But the platform extends all the way under the shopping mall (Waitrose's etc) out to the intersection between Cromwell Road and Ashburn Place.

semi-extrinsic 8y ago

So they may not have metal tracks, but they will be limited to similar turning radii as a subway line just to maintain passenger comfort going at 120 mph. No trains travelling faster than 60 mph are limited in turning radius by mechanical properties. Wrt. fire suppression: Tesla can state whatever they want, but they will either have to fulfill the demands set forth in NFPA 502 for fire suppression in tunnels, or they will never be allowed to open to the public. Civil engineering is very strict on these things, for a very good reason. For an underground train, you can have the train platform extend well beyond the actual station building. If you've ever taken the subway/tube in NY or London or similar you know what I mean. If not, look e.g. at this Google Maps of the Gloucester Road tube stop: https://goo.gl/maps/KQwuSz6RCUE2 https://goo.gl/maps/KQwuSz6RCUE2 The station building is the small square labeled Gloucester Road tube stop. But the platform extends all the way under the shopping mall (Waitrose's etc) out to the intersection between Cromwell Road and Ashburn Place.