The RhB modernised the line fundamentally, also for military reasons, and completely renewed the section at the top of the pass. Previously, the line formation on the north ramp of the Bernina Pass had been laid out in curves giving passengers extensive views, but also lying in the path of avalanche courses. The new parts of the line cut off those curves, the catenary and the flat bottomed rails of the old formation were removed, but the substructure is still visible in the high mountains.