London Overground staff are the latest transport workers to announce strike action. This morning (Tuesday, January 30), the union of Rail, Maritime and Transport (RMT) workers has announced that London Overground staff will be striking for 4 days over the next two months.During the strikes, part of an ongoing long-running dispute over pay, more than 300 people are due to take action. This will include strikes and action short of a strike, RMT has said.