It is a main door switch. It has four positions:

• Tur 1 - Open/close 1-st door
  
• ZU - Close all doors if allowed
  
• Freigabe - Allow opening by pressing buttons in passenger compatment and external buttons.
  
• Turen Offen - Open all the doors.

Then arrived at station, select "Freigabe" to allow passengers open the doors. Before departure select ZU and wait doors to be closed.

External "Door open" buttons:

Disabled passengers and passengers with baby carriages can press special button and block particular door, so they cannot be closed by driver setting the door swich into the "ZU" position.




If it happend, appropriate light-button will illumunate:




In this case, driver should be wery carefull and press appropriate light-button only if doorspace is clear. Then light-button will extinguish and door can be closed by "ZU" position.