Germany’s national railway company Deutsche Bahn has inaugurated the completely renewed signaling and interlocking technology on the Ruhr-Sieg line between Letmathe and Kreuztal. The new state-of-the-art digital technology makes the rail network more robust and reliable while enabling better control and greater flexibility of trains. Maintenance of the rail line will also take less work and be easier. The inauguration marks the first commissioning of a project in the federal government’s EUR 500-million Fast-track Program.The three interlockings in Nachrodt, Plettenberg and Altenhundem, all between 30 and 50 years old, were replaced with modern technology. The three newly installed modules in Altena, Plettenberg and Altenhundem are connected to the central Finnentrop interlocking that now centrally controls the entire route.On behalf of DB and as general contractor for the project, Siemens Mobility GmbH modernized the line’s signaling and interlocking technology in record time together with LEONHARD WEISS GmbH & Co. A total of 385 kilometers of cable were laid on 45 kilometers of the line between Letmathe and Kreuztal; 235 signals and 73 point machines were renewed; and nine new signal arms were installed. In addition, four level crossings were renewed or replaced, and eleven level crossings were adapted to the new technology.