Rheinbraun class EL 1 pushing a lignite train towards the Frimmersdorf powerplant on the Nord-Süd-Bahn of the Garzweiler lignite mine. These locomotives were specially made to run on this specialized local network, which connects the opencast lignite mines to the nearby powerplants. In contrast to the regular railway network of Germany, this one allows higher maximum axle loads and uses a different voltage system of 6,6 kV @ 50Hz in contrast to the usual 15 kV @ 16,7Hz.
The locomotives are also somewhat different from regular mainline locos, being very heavy, powerful, and slow, in addition to two intriguing features: They have a secondary set of pantographs that protrude from the carbody's upper corner at a 45° angle, allowing them to push the cars into the filling station without the regular catenary wire being in the way. Also, the cabs extend outwards, allowing the driver to run his train backwards without being completely blind. The train we see here is doing just that, as indicated by the red taillights.
This locomotive with the well visible number 544 was built in 1954 by Krauss-Maffei and AEG, in service for 58 years by now! Wikipedia claims that these were the first ever locomotives to use thyristor controls, but since those were only invented in 1957, that can't be true. Perhaps the locomotives were upgraded at some point in their lives, but I haven't been able to find any reliable info on that. If you know more than I do, don't hesistate to share!
Pic by Torsten: