We would reduce stress, save travel time, save our landscape and revitalize our town centers. Figuring the cost. This is for the pylons that support the rails, two sets of rails carrying traffic in opposite directions, and one hundred cars per mile of track. This figure assumes no land acquisition cost, because most of the time, there will be none. Cost per car.
Lets assume a thirty year life.
We'll multiply that figure by 3 to cover interest, energy, maintenence, and data services.