(Reuters) -German train drivers are set to stage a record six-day strike from Wednesday after their union rejected state-owned rail operator Deutsche Bahn’s latest wage offer. The GDL union announced on Monday that a fourth round of strikes in the ongoing wage dispute would begin at 2 a.m. local time (0100 GMT) on Wednesday until 6 pm (1700 GMT) on the following Monday, which would be the longest strike in Deutsche Bahn’s history. Cargo train drivers were called to begin their strike a day earlier, on Tuesday at 6 pm. The longest strike at Deutsche Bahn to date lasted five days in 2015. The la…