TSW2 routes would contain more than one 24h timetables. These can be set in different eras. Example: TSG is developing DB BR 420 for TSW2, but these trains will be removed from services in near future. If routes have timetables that are set in past, there can be trains that are not in use anymore.
Actually at the moment the Br420 runs in Cologne as the S12. Usually the Br423 run on the route but newly these trains are on the route
