Lake Constance Belt Railway

The Lake Constance Belt Railway is a name used for several contiguous railway lines around along the northern shore of Lake Constance in southern Germany. It was coined around 1900, when the railway ring around the lake was finished, and consists of the following sections:

Konstanz–Radolfzell, part of the High Rhine Railway

Radolfzell–Stahringen, part of the Radolfzell–Mengen railway

Source: Wikipedia