The cost of rail infrastructure renovations at the Gotthard Base Tunnel could overrun by several million francs. The is being caused by delays in replacing the tunnel’s radio communication system, reports the SonntagsBlick newspaper. +Get the most important news from Switzerland in your inbox The tunnel’s radio communication system allows train drivers to communicate with each other and contact the operations centre by telephone. It also allows passengers to continue browsing the internet and making phone calls, even deep within the Gotthard Massif. With the system’s lifespan nearing its end, it should have been replaced during scheduled maintenance work between 2024 and 2026. However, this work has been significantly delayed, according to SonntagsBlick, which refers to the government tender platform. These delays are reportedly linked to several factors, including technical and organisational problems with the external supplier, as well as complicated access to the tunnel.