In reply to Trangia:
Excellent post.
I've probably only done it a dozen times now.
A few years ago we went to Snowdonia for Easter Holiday. I wanted to take the kids up to the snow line. The Mrs spent 5 days protesting and asking if we could take the train. I point blank refused but eventually agreed.
So we turned up, paid £10 to park, then stood in the hall. Family ticket was something like £80. At this point Mrs had realised her mistake but too late, she'd pushed me, so paid the fare, still full fare but train was only going halfway due to snow.
We went up to the Halfway station. Got out, threw some snow balls, built a snowman and got back in the train.
At this point they announced that the train coming up the hill had broken down and there would be a wait while another train came up and retrieved it.
I think we sat on the train waiting for two hours to get down. By which time it was dark.
So. No. I've never been to the top on the train.