SOME 20,000 railway workers will strike for three days next month as part of a long-running national dispute over pay, working conditions and job security, RMT announced today.

The transport union said that its members at 14 train operating companies will down tools on July 20, 22 and 29. 

The walkouts, which are the latest to hit the railways since the dispute began a year ago, come as bosses and Tory ministers continue to ignore the union’s offer to enter further negotiations, it said.