Large format vacuum cleaning
In order to prevent dust from being kicked up when the trains pass through later, the tunnels were cleaned with a huge vacuum cleaner. This is important, on the one hand, so that drivers can already have a clear view during the trial run, which begins in September. On the other hand, the special "Schinkelblue" colour should only be applied to the starry sky when the danger of dusting has been reduced a little. For this reason, the vacuum cleaners were on the road at night this week. The oversized vacuum cleaner was pulled through the tunnel on a work train, and behind it the workers went and vacuumed the tunnel walls, tracks and also the ballast with a large brush.