It consists of a single Stadtbahn line, which includes a tunnel section between the city centers of Bochum and Herne.

Planned sections of the Bochum Stadtbahn northwest to Recklinghausen and southeast to Witten were never implemented due to the associated costs to these respective municipalities.

On this section, there are three at-grade road crossings, which renders it not a true metro system, but rather a light rail one.

In Gelsenkirchen, a tunnel was built as well – it begins at the train station and from there heads north, via the city center.

[3] The first of the modernized trains arrived back in Bochum in March 2024 and is due to be re-integrated into public traffic for the autumn of the same year.