Britain's railway signalling is crazy because Britain's railways pre-date railway signalling. If you build a brand new railway you definitely shouldn't repeat mistakes from the 19th century.
Britain drives on the Left. Should you drive on the left too? Only if your neighbors do.
But on the other hand Britain decided to buy up all the doctors and hospitals and stuff to give everybody healthcare and that's worked out pretty well.
British public schools are run by members of the public for any members of the public (who can pay and pass the exam).
American public schools are run by local government only for people the local government wants to admit (based on where you live etc).
Eh? Everyone is admitted to public schools in America. You often don't get the choose the specific school, but everyone has the right to a place in a school.
In the same school system, some of the schools are out-of-this-world, while others are zoos.
If I had the choice between sending my kids to some of the schools I went to growing up, or letting them stay home and watch cartoons all day, I'd choose the latter. At least they're not going to get shivved watching Adventure Time.