When Generalsanierung is over, they can start again right away. That's just the maintenance/running cost. What is needed is building turnout tracks and other stuff to avoid delays. The delays turn people away from riding trains, or buying tickets. We want to combat climate change, but our train service is so bad, that people prefer to drive 4-person cars, alone, for hours, during which they need to be paying attention to the road at all times, instead of sitting in a train and relaxing, or getting stuff done, that they can do during the ride. There is something fundamentally wrong.