BERLIN—German railway workers are going a nationwide strike starting Tuesday night, the head of the GDL union said after announcing that 95 percent of its members had voted to back the move. Travelers were warned to expect disruptions. The head of the GDL union, Claus Weselsky, told reporters the strike would start with all cargo trains at 7 p.m. (1700 GMT) Tuesday and expand to include passengers trains from 2 a.m. (0000 GMT) Wednesday until 2 a.m. Friday, The union is demanding a 3.2 percent salary increase and a one-time “coronavirus bonus” of 600 euros ($703). German train operator Deutsche Bahn has rejected the demands. The company has lost billions since the start of the pandemic and from recent floods that destroyed or damaged numerous railroad tracks. Deutsche Bahn said only about a quarter of its long-distance trains will run on Wednesday and Thursday, with priority given to connections between …