eurostar
long distance trains are a bit of strange thing in the UK. our trains generally don't go between countries like they on the continent. the worst that can happen in the UK is that you get inconvenienced a bit.
but the eurostar makes this sport a little more exciting. get the wrong train and you end up in paris rather than brussels. get to brussels and get on the wrong train and you can end up anywhere.
luckily i made it to Ghent safely.
It certainly is easy to get lost on the continent. Not long ago I attempted a journey from Schipol airport to Amsterdam, but ended up in Utrecht. It was a nice scenic journey, tho, so was definitely worth it.
i went to Ultrecht once (deliberately). And it was very nice.
if you've got time i'd highly recommend getting on the wrong train. you just need a good excuse when the ticket man comes along. and a window seat.