Members of the Rail, Maritime and Transport (RMT) union who work for Network Rail and 13 train operators are taking part in three days of industrial action - on Tuesday, June 21; Thursday, June 23, and Saturday, June 25. It's the biggest rail strike in 30 years, with fewer than one in five trains running on the strike days, bringing travel chaos to passengers across the UK.
Trains will only be running on main lines, however, those services will be starting later and finishing earlier. It will mean services that will run will only do so for about 11 hours on the strike days.
But what's behind the strike? We look at the key players in the dispute, what the union members asking for, how much rail workers are currently paid and who will be impacted by the industrial action.