Optimizing the length of air supply duct in cross connections of Gotthard base tunnel

 “Gotthard Base Tunnel” with its 57 km long twin tracks is going to be the world’s longest train tunnel. The two tracks are connected to each other by means of 178 cross connections provided at regular intervals along the length of the tunnel. These cross connections are primarily used as technical rooms with operation relevant electronic devices installed in them. Additionally, these cross connections can be used as emergency exits from one tube to the other. All of these cross connection rooms are installed with mechanical ventilation systems in order to assure the air temperature limits for the optimal working of the installed electronic devices.