Actually the leaves on the line problem is more to do with the design of modern trains. Where the majority of modern trains are disc braked, this means that the wheel treads aren’t cleaned by the brake pads, whereas older trains used the cast iron block acting on the wheel surface.
This has the action of effectively cleaning any crap picked up on the wheel surface and thus improving adhesion between the wheel and railhead.
Having slid 14x and 15x units the length and breadth of the North of England I would say that’s sound in theory but in the real world it doesn’t make a blind bit of notice.
Over here we can run normally (with a few caveats thrown in) with up to 8″ of snow above the railhead, but to be honest when do we get that amount of snow in the most of the UK?
I envy that Driver, oh to be able to do that to a platform full of right wing, Telegraph reading, watch tapping, union bashing, self important me me me me me types….