You could - at a stretch - imagine how #CrossChannelRail trains to London could depart Gleis 5 at Köln Hbf In this article - with loads of photos and plans - I explain how you could do it: https://jonworth.eu/trains-to-london-from-gleis-5-at-koln-hbf-its-bold/ Whether you would actually WANT to is rather harder to answer!