Ashikase, I just took a look at Metro and it seems a great project, althought its data is protected in the license. The pdb files seem to be compressed or encrypted or just binary, but not straightforward and illegal to copy. I also tried their web interface and although I liked the idea itself, it returns you a path given the start and end points. I like better the graphical interface of the U-Bahn Navigator.
By the way, the link still works for me.
Best,
lusico