A small bar and restaurant (Steam locomotive restaurant) at the S-Bahn station at Erkner (end of a line) which looks unpromising from the outside, but inside is cosily furnished with solid and comfortable wooden tables and seats with cushions as comfortable as in an old first class carriage.
They also make the best Soljanka (meat and vegetable soup of Russian origin, only available in the East) I've ever tasted, especially after a walk by the nearby lakes.
Take the number & S-Bahn to Erkner, or save time by going on one of the frequent DB regional train bound for Frankfurt an der Oder, which also stop there. Berli city tickets (valid for zone C) may be used on both
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