Thieves work the stations in the wee hours. Be on guard. Train stations are major bus stops, so connections from train to bus are generally no more difficult than crossing the street. Buses go from the stations to nearby towns that lack train service. If you have a bus to catch, be quick as many are scheduled to connect with the train and leave promptly.
Many cities have more than one train station.
Be sure you know whether your train is leaving from Interlaken East or Interlaken West, even if that means asking what might seem like a stupid question. A city's stations are generally connected by train, subway, or bus. You can also avoid arrival frustrations by finding out if your train stops at a city's main station rather than a suburban one. Note that it will stop at three different stations in Berlin. Finding the right train is largely a matter of asking questions, letting people help you, and assuming things are logical.