"However, it must be taken into account that in most European countries routes are simply closed as soon as construction begins. This is not possible in Switze

"However, it must be taken into account that in most European countries routes are simply closed as soon as construction begins. This is not possible in Switzerland because of the busy rail network. That's why operations in Switzerland continue during construction and renovation work - which poses more risks." https://www.srf.ch/news/schweiz/unfaelle-mit-bauzuegen-gleisbaustellen-als-gefahrenhort https://www.srf.ch/news/schweiz/unfaelle-mit-bauzuegen-gleis...