Oh certainly, sunk cost, the industries entirely dependent on cars, etc. But we regularly have to rebuild those roads anyways, and how much money is being throw

Oh certainly, sunk cost, the industries entirely dependent on cars, etc. But we regularly have to rebuild those roads anyways, and how much money is being thrown away trying to make cars less awful? There's a rural cost/benefit that ensures we will never not need cars, probably. But I can't fathom why eight lane interstates exist. If we can justify that many lanes of road traffic, we can certainly replace six of them with a train. Self-driving trains? Easy. And no matter how hard you try, even the most efficient electric car will never end up greener than a train on a per user basis.