> the Caledonian Sleeper has to be one of the railway highlights of the UK

ahh, I've really wanted to like it, but I've found it exceptionally uncomfortable each time I've used it, and also very expensive. I much prefer the sleeper trains in Thailand

> Train travel in the UK can be highly scenic

The UK really is very pretty. It's easy to forget when in countries with blockbuster scenery, but British countryside really is a joy to look at.

EDIT: one day I'd like this to be an overnight Zeppelin route, but it's never going to happen