consisting of class 143 locomotives and five Silberling carriages. A change of the service to double-deck coaches was planned and vehicles had already been ordered. After the opening of the Cologne/Bonn Airport station on 13 June 2004, the Rhine-Erft Express was diverted to run through it. As travel through the airport tunnel required vehicles with the modern German emergency brake system (), the line was operated with new class 425 electric multiple units in double sets. Notes See also List of regional rail lines in North Rhine-Westphalia List of scheduled railway routes in Germany External links Rail services in North Rhine-Westphalia Named DB Regio services