IC2375, the 10:56 Westerland - Karlsruhe InterCity, wasn't scheduled to stop at Morsum but it did on 27 September 2015. There was some signalling between driver and guard then the doors opened and the passengers spilled out onto the platform, some for a breath of fresh air, others to light up.
The driver indicated that there was a control problem at Niebüll and they would be there for a while. After almost an hour, the signal turned green, the passengers were herded back on board and 218.359 and 218.371 were on their way again. In all that time, the sun was only out for a few seconds but that was long enough to get this shot.