This works also towards animals. For example, on top of the information displays at outdoor stations, there are spikes, as seen on this picture: https://uploa

This works also towards animals. For example, on top of the information displays at outdoor stations, there are spikes, as seen on this picture: https://upload.wikimedia.org/wikipedia/commons/6/6d/IMG_6146_Hamburg_Hbf.JPG https://upload.wikimedia.org/wikipedia/commons/6/6d/IMG_6146... These prevent birds from sitting on these displays, which keeps the displays clean and prevents passengers waiting below that display from unpleasant surprises.