Flat wagon type Res687 with no. 3780 3939 020-8 D-SGL in Wuppertal-Oberbarmen on 11th of June 2013.
It seems that it is one of the wagons, which was taken out of service by DBAG in 2000 and sold to private companies.
Photo ©Arnim v. Herff.
Picture is optimized for CRT. Presentation on TFT LCD could be unsatisfactory.