Get it. Use it. Love it.
I found this worked great, as well or better than any similar apps Ive used for the trains in NYC where i live. I love Berlin, and part of what i love is the excellent public transport. Ok, and the bike lanes, but thats another story. Anyway, this app made the Berlin transit work for me, and that made me like the app, and the city!
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Berlin Subway: S & U-Bahn map