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Here is a link to the project page on The Boring Company's website: <a href="https://www.boringcompany.com/chicago/">https://www.boringcompany.com/chicago/</a> I can't see how the pictured skate fit into a 14 ft diameter tunnel. There is another challenge I see. A high-speed vehicle in a tunnel moves in front of it a significant pressure wave. The smaller the tunnel diameter the more air gets moved, the higher the resistance and the power need. Larger tunnel diameters and the right vehicle design would allow air to get out of the way and to flow along the vehicle. Will be interesting to see how The Boring Company will solve this. There are reasons why HSR tunnel have diameters of about 30+ ft. Therefore the railcars have to be pressure-tight to avoid ear pain. Nevertheless you realize the entrance into a tunnel in your ears. The question how many TBM to use is a question of time and costs. One Herrenknecht TBM for the Arrowhead East and West Tunnels cost about $9 million. Regards, Volker Regards, Volker
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