Originally Posted by
econprof
Hmm... there are two segments of the train that join in Cologne, so it's a bizarre suggestion to get off in Siegburg and wait for the "next" train.
It's two EMUs coupled together.
He meant: get off the front one (preferably at the very last door of the very last carriage) and, while the train is at the station, walk to the first door of the first carriage of the second EMU and get back on.