If you are a fan of live real-time maps of train networks then you might like:
Signalbox - shows the location of trains in the UK
Travic - animated maps of over 700 transit systems around the world
Train Map - a live map of the Belgium rail network
Swiss Railways Network - the original real-time map of Swiss trains
Trafimage - the entire public transit network of Switzerland in real-time
Mini Tokyo 3D - a live real-time map of Tokyo's public transit system (in 3D)
Zugverfolgung - real-time train tracking in Germany, Austria, Switzerland, Belgium and the Netherlands.