Comment by bluGill
8 hours ago
Suburbs are dense enough to support transit as proven in a small number of cities around the world (mostly not English speaking). However suburbs can only support great transit, since anything less and driving is enough better as to be worth it.
NYC has a real cost problem. Digging a tunnel costs a lot - not anywhere near what it costs in NYC. You can also build bridges over the top for a lot less than digging a tunnel. Modern subways should be 100% automated saving the cost of a driver. (I keep hoping we see self driving buses since drivers are the large share of the costs)
NYC tunnels have outsized cost, but even tunnels that cost 10% of that would not be cheap. Most of the NYC subway was built quickly and relatively cheaply by digging trenches and covering them later, not by boring tunnels. NYC used to use elevated trains a lot, and still has plenty of those outside Manhattan, but they have other downsides, such as noise.
NYC subway has two drivers per train due to the trade union resistance. Very understandable, even though not really necessary.
Self-driving buses could be also remotely driven in situations that require special handling, by a smaller number of drivers.
As usual, it mostly takes a political will, the technology is not rocket science; one of the poster kids of that is Curitiba in Brazil.