Me and my wife did the Inverness to Thurso line a couple of years back. Supposed to be in the top 10 rail journeys in the world.
It was fantastic, and amazing to think there are train stops up in the highlands where you stop the train like you do a bus, they're that remote.
But, it's a four hour journey and an hour in, with only us and one other couple on the train, the bloke (who turned out to be from Blackburn) decided he wanted to come over and make friendly conversation. We couldn't get rid of the mithering bastard. Eventually we both had to feign sleeping to get him to piss off. But of course it spoilt our journey somewhat