AFAIK in Switzerland each line had its own Läutewerk, so a through station always had a pair of bells and junctions had as many as there were lines. If I remember it well Kreuzlingen, where the Schaffhausen-Rohrschach line crosses the Mittelthurgaubahn, had four bells. However, I have never seen a Läutewerk in Germany, and the few I have seen on photographs were single.

Herbert