> $3.5 billion/mile is a lot to pay for new track! That's mostly paying for the tunnels, not the track. It shouldn't cost nearly that much, but it's not surpri

> $3.5 billion/mile is a lot to pay for new track! That's mostly paying for the tunnels, not the track. It shouldn't cost nearly that much, but it's not surprising that it isn't cheap either: the tunnels are being constructed under some of the densest and most expensive real estate in the world, and the resulting stations are significantly larger than others in the system. And note: if you think that's expensive, you won't believe what it costs to repair highways in NYC[1]. [1]: https://ny1.com/nyc/brooklyn/news/2020/02/25/city-council-floats-two-repair-plans-for-the-bqe https://ny1.com/nyc/brooklyn/news/2020/02/25/city-council-fl...