In long-distance traffic, the Cologne–Aachen high-speed line is operated with ICE International services using class 406 sets and Thalys services using PBKA sets.
This offer is supplemented by individual Intercity and Intercity Express services that run once a week and thus create direct connections to/from other regions in Germany at the weekend.

The Regional-Express services RE 1 (NRW-Express) and RE 9 (Rhein-Sieg-Express) serve the entire length of the line hourly and together provide an approximately 30-minute cycle.
The NRW-Express is operated with push–pull trains composed of double-deck carriages from Bombardier and class 146.0 locomotives.
The Rhein-Sieg-Express is operated with locomotives of class 146.0 or class 111 as well as Talent 2 railcars in coupled sets.
Class 120.2 locomotives were also used until 2018.

Between Cologne Hauptbahnhof and Köln-Ehrenfeld, the RE 8 regional express (Rhein-Erft-Express) service is operated with class 425 multiple units and the Regionalbahn RB 27 service (Rhein-Erft-Bahn) with push-pull trains consisting of three double-decker coaches and a locomotive of class 143.
Between Cologne and Horrem, the Regionalbahn RB 38 service (Erft-Bahn) is operated with class 644 railcars and S-Bahn services S 13 and S 19 with class 423 multiple units.
The S 12 service also runs between Cologne and Düren with class 423 sets.

Euregiobahn services on the section between Aachen Hauptbahnhof and Stolberg Hauptbahnhof are operated with Bombardier Talent DMUs every 30 minutes in coupled sets on weekdays and in single sets on Sundays.
The Euregiobahn services leave the Cologne–Aachen line between Stolberg and Langerwehe and return to Langerwehe and Düren, running hourly.
In long-distance traffic, the Cologne–Aachen high-speed line is operated with ICE International services using class 406 sets and Thalys services using PBKA sets. This offer is supplemented by individual Intercity and Intercity Express services that run once a week and thus create direct connections to/from other regions in Germany at the weekend.
The Regional-Express services RE 1 (NRW-Express) and RE 9 (Rhein-Sieg-Express) serve the entire length of the line hourly and together provide an approximately 30-minute cycle. The NRW-Express is operated with push–pull trains composed of double-deck carriages from Bombardier and class 146.0 locomotives. The Rhein-Sieg-Express is operated with locomotives of class 146.0 or class 111 as well as Talent 2 railcars in coupled sets. Class 120.2 locomotives were also used until 2018.
Between Cologne Hauptbahnhof and Köln-Ehrenfeld, the RE 8 regional express (Rhein-Erft-Express) service is operated with class 425 multiple units and the Regionalbahn RB 27 service (Rhein-Erft-Bahn) with push-pull trains consisting of three double-decker coaches and a locomotive of class 143. Between Cologne and Horrem, the Regionalbahn RB 38 service (Erft-Bahn) is operated with class 644 railcars and S-Bahn services S 13 and S 19 with class 423 multiple units. The S 12 service also runs between Cologne and Düren with class 423 sets.
Euregiobahn services on the section between Aachen Hauptbahnhof and Stolberg Hauptbahnhof are operated with Bombardier Talent DMUs every 30 minutes in coupled sets on weekdays and in single sets on Sundays. The Euregiobahn services leave the Cologne–Aachen line between Stolberg and Langerwehe and return to Langerwehe and Düren, running hourly.
Cologne–Aachen high-speed railway