It is very expensive and time consuming to do major infrastructure projects in San Francisco. Case in point: "Due to the capital cost ($1.578 billion for the 1

It is very expensive and time consuming to do major infrastructure projects in San Francisco. Case in point: "Due to the capital cost ($1.578 billion for the 1.7 mile light rail line), the Central Subway project has come under criticism from transit activists for what they consider to be poor cost-effectiveness.[20] In particular, they note that Muni's own estimates[21] show that the project would increase Muni ridership by less than 1% and yet by 2030 be adding $15.2 million a year to Muni's annual operating deficit." https://en.wikipedia.org/wiki/Central_Subway https://en.wikipedia.org/wiki/Central_Subway