If you believe that non mass transit is cheap, I have a $6.3 billion half of a bay bridge to sell you.
The question is not if mass transit is a good idea, clearly it is given certain demographic and geographic situations, it is more about how to run such a system. I am for private ownership as being more efficient but I am open to government ownership given the massive capital costs involved. My real objection are with government ownership the goal still has to be to extra surplus value and not let labor unions destroy insentives for greater efficiencies.