We can't build any public infrastructure in the US anymore. Too complicated between environmental regs, NIMBYism, and corruption.
I know it feels that way, but it's not strictly true. Here in Seattle in the last decade we've built a new floating bridge, multiple miles of underground light rail track, and nearly two miles of deep bore road tunnel.
I think there is a real problem that our new infrastructure is way too expensive and takes way too long to build, but we've demonstrated that we can definitely build new stuff.
They could've used that to link up Seattle, Tacoma, Redmond, Kent, Bainbridge Island, Vashon Island, and the entire Seattle area.
And to keep costs of building the infrastructure down, then they should consider outsourcing it, and hiring Chinese labor. (Apparently, the Chinese are very good at building railroads.) That way, you keep development costs down, and afterwards, the local citizens can enjoy first-world infrastructure, at low rates.
But, when infrastructure projects become billion dollar estimates, then that just kills any opportunity of it ever being developed. Simply, because it now becomes a major high-paying jobs program.