Public transport in Switzerland is generally very safe. Security staff also regularly travel by public transport in order to ensure passenger safety and make their presence felt. Generally, any criminal offences that do take place on public transport are on a small scale. The most common offence is using public transport without a valid ticket. Nevertheless, passengers should still ensure they take the usual precautions to protect themselves against petty criminal acts.
To find out more about travelling safely within Switzerland: safertravel.ch