If we could efficiently dig straight-line tunnels under the Northeast Corridor, would it actually make sense to stick a hyperloop in them? The reason trains ar

If we could efficiently dig straight-line tunnels under the Northeast Corridor, would it actually make sense to stick a hyperloop in them? The reason trains are slow on (some of) the Northeast Corridor is because (1) tracks aren't straight (2) population density means you're frequently running through cities and (3) trains stop all over the place, so people can actually get on and off. The hyperloop sacrifices throughput for speed, but if you ran a conventional-style train fast through straight tracks underground, you could still do DC to NYC in 90 minutes or less, with a much higher throughput. Letting an order of magnitude or two of people make the trip in 2-3 times the time seems way more valuable than letting the smaller number make it faster.