Overview
- The service reduction runs from Friday, 14 November at 21:00 until a planned restart on Monday, 24 November at 05:00.
- Only the night of 19–20 November brings a complete closure of the station.
- S‑Bahn operations largely continue because those tracks already use a separate digital control system.
- Many long‑distance trains stop at Köln‑Ehrenfeld or Köln Messe/Deutz or bypass the city, while several regional lines are rerouted, including RE1 and RE5.
- Operators advise checking apps and online timetables, with some replacement buses in select nights as technicians test the new system and dispatchers complete simulator training.