No, I don't want to publish the map yet. It is far more than a demo map, but it's somewhat private to me and some friends. Maybe one day we will decide to publish it.
However, I would like to help you building new subway lines on your server, even with signal controlling. I suggest you add a spawn building and then let us create 2 or 3 initial subway lines, and when more buildings are added, we can build more lines.
Maybe you can already lay tracks for these initial lines, I can do the signalling later.
And if we had a main station near spawn, we could build passenger train lines to far-away cities.
EDIT: Ah, one request: use slabs and low platform nodes for the platforms, that looks better.
EDIT2: the wiki page
http://www.linux-works.de/Wiki/MineTest under "Mods" is outdated
EDIT3: I have registered my account on the server. Apparently nothing's built yet.
EDIT4: Please immediately update advtrains, just recognized that the privilege enforcement did not work (this is a security leak)