A very small train maintenance and hire company, running DEMUs designed for the Hastings-Tonbridge Wells line.
I can't imagine why I would ever need this, but it's sort of interesting that it exists.
Handy index of public data from the UK rail industry.
Includes some more visualisations of the routing guide, although the original is actually pretty good to start with.
The book that tells you what "ANY PERMITTED" means on a National Rail ticket. It's remarkably complicated, and produces some interesting results (e.g. it claims I'd be able to travel from Dundee to London via Aberdeen, although I suspect I'd get some odd looks if I actually tried that).
Lots of London Underground stuff.
I was wondering what London's trams looked like. (And chasing links to find that Dundee used to have a fairly extensive tram system...)
Handy reference to bus services in Dundee.