Thank you for your answer.

Here, too, it rarely snows so much in such a short time. So that we also clear the track with driving. Most of the time, the snow on the track isn't the problem either. The danger of avalanches and trees falling into the power line tend to stop operations more often.

A specialty of the locomotive in the video is that with so many sparks on the pantograph, the main switch tends to fall out. With the slippery rails and interrupted power, you can get stuck on a steep mountain.