It is possible to fabricate an elevated, structural concrete beam in an automated fashion so that it costs nearly 100x less and can be built 10x faster than the typical cost and speed of such infrastructure construction. This is described here: highways.today/2021/08/02/super-rail-multi-function-rail , Such rail is not only very cheap, it can be paid for through utility access fees so that mass transit ridership can be free. It is so cheap, that private enterprise can afford to build it just for the utility fee profits. And it has the potential to replace airline CO2 with airline speed rail-type public conveyance.
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