staffsblue
Well-Known Member
Cologne is outside of the VRR public transport system but you only need to buy a return to the first station inside the VRR rather than the whole journey. I cant remember the name of the station at the minute, but ask at the desk and you'll be fine.
Langenfeld by the look of things from the map on the VRR website, but probably better off getting a ticket from Cologne to / from Dusseldorf if you want to catch an express train...
http://www.vrr.de/imperia/md/content/fahrten/verkehrsplaene/vrr_schienenschnellverkehr.pdf