I've been told that the Model 3 isn't comparable to the M3 at all because you can't run it on the track all day long.
I did some real rough math with some reasonable (IMO) estimates and robo semis might get the cost of freight down to within 30-50% of rail...but days instead of weeks of travel.
Anyone have the numbers for short-haul vs long-haul mileage? I understand that first generation Tesla Semi will be practical only for short hauls. Still expect that to be huge savings of cost and pollution.