The train from LA to Flagstaff hits 70+mph at times, though the average is around 50mph once you factor in stops and waiting for freight to pass. The biggest t

The train from LA to Flagstaff hits 70+mph at times, though the average is around 50mph once you factor in stops and waiting for freight to pass. The biggest thing slowing down US passenger trains is that the routes are leased from freight lines and the freight trains take priority.