We still have a lot of level crossings here on the 'mainland' and I'm fairly sure that I haven't been over more than one this century - I go out of my way to avoid them. The one that I used to have to use, I have now discovered a route to avoid it.
The crossings can be on quite serious high-speed mainline sections - we had this one only recently - http://www.bbc.co.uk/news/uk-england-norfolk-30047183 .
A few miles from me is the Hixon crossing, which was, at last, replaced with a bridge a few years ago, long after the 1968 crash. http://en.wikipedia.org/wiki/Hixon_rail_crash
As you can tell, I don't really like the things...