Traces of time

Now this one is from reality, chosen from a sample of one. If you ever wondered what happened to abandoned train tracks, here's one idea. Further along, they've been ripped up, and a broad walkway has overgrown, but here, the iron is just lying there. For the moment, we will restrict our explorations to rural overland lines, but inevitably we will end up under major metropolitan buroughs, in abandoned tunnels, the subconcious of a nation. Thusly is the planet interconnected, and through the tunnels resound strange musics..