A train of OSB (Ortenau S-Bahn) 510 in Offenburg Central Railway Station.
This nice train is VT 511 "Kappelrodeck". The other should be VT 510 "Oberkirch", because these units (VT509-VT513) also allowed on SNCF lines.
Thanks for the hint.
I did not know they railcars are also permitted in France.