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I don't actually get how it can be this cheap; your tunneling through 100 kms of mounatinous earth and filling it with rare-earth superconductors. In contrast European subways average out to around 100 million per km to put a couple rails in a concrete tube

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If anything like the LHC, the tunnel will be much smaller in diameter. The LHC, designed to reuse the existing LEP tunnel, is just 3.8m in diameter.

https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.2011... http://atlasexperiment.org/photos/lhc.html

The subways have to be safe for human passengers, interface with stations, and be built in populated areas without disturbing the buildings above.

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