On this line, the city is a stop for InterCity services between Stuttgart, Singen, Schaffhausen and Zurich HB.

The High Rhine Railway (Hochrheinbahn) provides connections to Waldshut and Basel Bad Bf towards west and to Radolfzell and Konstanz towards east.

Singen owes its development from a farming village into industrial town primarily to its role as a railway junction.

Large Swiss companies established their German branch factories in Singen, not least because of its good rail connection.

Singen is, for customs purposes, a border station for passengers arriving from Switzerland using direct services without intermediate stops.

Every two hours, it is served by Swiss Federal Railways (SBB) services hauled by Taurus locomotives of the Österreichische Bundesbahnen (ÖBB).

[5] Furthermore, on weekends two pairs of Inter City services, operating as the Bodensee (Lake Constance), connect Konstanz with Dortmund and Emden.

In regional transport, Interregio-Express and Regional-Express services stop in Singen, giving through connections to Karlsruhe, Stuttgart, Basel, Konstanz and Ulm via Friedrichshafen.

The S6 of the Bodensee S-Bahn connects Singen to, among other places, Engen as well as Radolfzell, Konstanz and other municipalities on Lake Constance.