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It will be interesting to learn the reason for the fire. With his set goals Musk naturally ended up with a battery vehicle. He wants to go 150+ mph and wants to minimize the tunnel diameter. Under these conditions you can't use a catenary (too large diameter) and a 3rd rail, as that only allows up to 100 mph. On the other hand HSR tunnels have a large diameter avoid to the effect of a piston in a pipe. Perhaps the vehicle's aerodynamics lessen this effect or the tunnel get high enough for a catenary. We know next to nothing about the final Chicago system but the promotional video. But that has nothing to do with small tunnel bores.  Regards, Volker
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