Aye, but your forgetting your metal box does 110mph if you want it to, typically does 70mph, or a little over
at times.
And your relying on not just your maintenance, but the maintenance of every car around you, and the common sense as well as the observation of everyone around you.
A train, does 125mph... but its an isolated metal box with nothing else around it, the only thing that causes accidents are either human error (just as serious on a motorway), or a sudden obstruction of the line (again, just as serious on the motorway). You dont get driving miss daisy pulling out on you at 70mph and slamming the brakes on because she dropped her phone and took her eyes off of the road.
Im just not seeing why your nervous about train travel, yet like driving a car. You more than any other person I know has the worse luck with cars, surely you understand the ease at which a cock up can quickly turn deadly?