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I don't understand why they would dig a tunnel to make a private Tesla-only highway instead of just putting in the overstreet light rail system that they voted down in 2018. Like it seems stupidly impractical and expensive. New york has underground subways because it's a very densely packed metropolis. Why does Nashville need an underground transit system?

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Probably because the tunnel is privately funded. Conceivably you could do both for the same money.

I would assume that the tunnel would be more expensive to build than a light rail system, and that the light rail system would cost less for riders. The light rail system could also have stops other than the airport (I'm not familiar with Nashville's layout). It seems to me like this tunnel is good for tourists and people with enough money to avoid public transportation, but pretty much useless for anyone who lives in Nashville

The city isn't paying for the tunnel, the company is.

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