zug nach rudow.WAV

The U7 is a rail line on the Berlin U-Bahn. It runs completely underground for a length of 31.8 kilometres (19.8 mi), through 40 stations; and connects Spandau, via Neukölln, to Gropiusstadt and Rudow. As of 2007, the U7 is Berlin's longest underground line, both in terms of absolute length and total travel time and one of the longest subterranean lines in Europe.

And here we go: the automatic voice tells you, that this is the train to Rudow (I couldn´t resist naming this track like that).

Inside microphones of a Sony PCM-M10.