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BERLIN, GERMANY - MAY 20: Passengers arrive from a local train at Alexanderplatz train station during a train strike on May 20, 2015 in Berlin, Germany. German rail carrier Deutsche Bahn (DB) is working to compensate with modified rail service as the GDL union of engine drivers in Germany, representing approximately 20,000 train drivers, goes on strike to demand a 5 percent pay hike for conductors as well as a two-hour cut in drivers' weekly hours and the right to additional representation for other rail workers. The current strike is the union's ninth after negotiations with German rail carrier Deutsche Bahn failed to reach a satisfactory conclusion last year, and is the third such strike in 2015. (Photo by Adam Berry/Getty Images)

BERLIN, GERMANY - MAY 20:  Passengers arrive from a local train at Alexanderplatz train station during a train strike on May 20, 2015 in Berlin, Germany. German rail carrier Deutsche Bahn (DB) is working to compensate with modified rail service as the GDL union of engine drivers in Germany, representing approximately 20,000 train drivers, goes on strike to demand a 5 percent pay hike for conductors as well as a two-hour cut in drivers' weekly hours and the right to additional representation for other rail workers. The current strike is the union's ninth after negotiations with German rail carrier Deutsche Bahn failed to reach a satisfactory conclusion last year, and is the third such strike in 2015.  (Photo by Adam Berry/Getty Images)