Following a vote, members of the RMT union will go on strike on 21, 23 and 25 June. Disruption is also expected on non-strike days because of too few staff working overnight. A special timetable from 20–26 June will be in effect. The RMT union includes drivers, guards, catering staff, signallers and track maintenance workers, and the action will effectively shut down the national railway network. It is anticipated that the service across Great Britain will be reduced to a fifth of its normal levels.