On a recent trip to Wales I was allowed into the locomotive car to see the engineers at work. The Talylynn Railway is a narrow gauge track and it used to be used to carry slate from the slate mines.
This video is a little shaky, and a little on the long side, as Internet videos go, but I think its pretty interesting. You can see the countryside going by, and you also learn a good bit about driving a train.
If this gets you excited, you can take your train fetish even further and go to Wales and ride on them. (There are lots of them.) This particular line has been in continuous operation since 1865.
For more information, go here.