143 594-0 at the rear end of an S 13 train to Cologne, seen in Düren in the evening of 5 March 2003. This is the only loco hauled train of the S 13, it runs in the evening on work days (Monday to Friday). From Horrem, where it is "transformed" from an S 6, it first starts to Cologne, then making one trip to Düren and back before it's duty ends in Cologne.
Digital photo by Christoph Schmitz