There is abundant evidence that any economically viable investment in transport infrastructure leads to a dramatic increase in land values in the areas served. Compare house prices in Islington, served by three tube lines, with similar properties in adjoining Stoke Newington and Hackney, off the tube map. Urban rapid-transit systems enhance not only the value of land used for commercial purposes, but also residential land values. The beneficiaries are whoever owns the land.
All that is required is a mechanism which will claw back site values, such as a universal property tax based on land values.