German national railway Deutsche Bahn has warned of massive travel disruptions after the train drivers’ union GDL announced a six-day strike against the railway. The strike will begin on Wednesday at 2 am (0100 GMT) and continue until 6 pm on Monday the following week, GDL said in a statement released in the early hours of Monday. Union members at DB Cargo, which is responsible for freight transport, had already been called to strike from 6 pm on Tuesday. Deutsche Bahn said an extremely limited emergency timetable of long-distance trains and local commuter S-Bahn rail service would continue th…