When you say trolley, are you suggesting auto-coupling rail? Or was that meant to be paved roads? If paved roads, then you're forgetting the enormous wear that

When you say trolley, are you suggesting auto-coupling rail? Or was that meant to be paved roads? If paved roads, then you're forgetting the enormous wear that heavy vehicles put on road surfaces (which would get much worse as labor costs were taken away as a downward pressure on road freight volume.) If rail, then I think you could see some version of that as a logical upgrade to a high-utilization rail network in a high-trust society with a strong safety culture. I see the US becoming lower-, not higher-, trust.