Pretty amazing project.
What's about picasa or abload.de?Here's a map I made some time ago:
It shows all Tram, Stadtbahn and S-Bahn lines in the Ruhr Area, and it also indicates whether they have their own right-of-way or if they run in mixed traffic.
Unfortunately, I don't know how I can host the entire image, because it is so huge. I tried Tinypic, but as you can see it scales the image down.