In 2009 Siemens and DB Schenker conducted an experiment with unit 189 065, during which it was equipped with Faiveley Transpact TTK automatic couplers, also known as C-AKv couplers. The results were promising because DB Schenker decided to equip 18 units, then to be used for the heavy ore trains from Rotterdam [NL] to Dillingen [DE], replacing 6400 diesel units in the Netherlands and the 151 series in Germany.
Siemens started the refit-program in February 2010, the first four units were outshopped in Munich on 06.03.2010. These units are easily recognized by the yellow painted couplers and yellow warning vinyls are their frame ends.
The 189 030-032 and 036 left Munich in 06.03.2010, heading for Gremberg.