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Cool! It would be awesome to see the trains moving in real-time (even if it wasn't "live", and just based on posted schedules).

Where the data is available, it shows live movements of the trains, and where that data is not available, the trains follow scheduled movements.

A further explanation of this is here: http://geops.de/blog/worldwide-travic (German)

Netherlands, based on live data: http://spoorkaart.mwnn.nl/ . It exists for some other European countries too, I think.

Click on the "Spoorkaarten in het buitenland" link in the bottom right for more countries.