Rail - Tunnel
Many tunnels, such as in Switzerland (Gotthardtunnel) and in Norway (Laerdaltunnel), have a traffic density that is so high that the tunnel cannot close for maintenance.
Lighting maintenance in a tunnel is not only a big inconvenience but also a costly thing.
In these cases, people need a low-maintenance lighting system like QL.
A choice for QL is a choice for Proven Technology!