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American infrastructure planning is outdated. The rest of the world has moved onto elevated rail. It's much cheaper, very quiet, complete weather capable and automated around the world these days. The difference is being using old corridors, prefabricated concrete for above ground and cut/cover tunnels Montreal plans on building 100km of automated rail for $13 billion USD.
Meanwhile the 2nd avenue bored tunnels will cost over $17 billion for 27km. Bored tunnels are bad, theyre too expensive for anything but the most necessary projects. Build elevated rail through this area, cut/cover tunnels if it's a must. Stay away from bored tunnels.
Pic related is a gantry putting together the montreal rem
