The current planned strike dates are June 21, 23 and 25 but a certain amount of disruption can be expected on non-strike days as well.
The services are provided by Great Western Railway and Cross Country.
There will be a severely reduced timetable in operation over the strike days with trains only operating between 7.30am and 6.30pm and no service running to or from Cornwall for on Devon’s branch lines.
The strike has been called by the National Union of Rail, Maritime and Transport Workers (RMT) over pay and jobs.
RMT general secretary Mick Lynch predicts a long fight with Network Rail with strikes possibly carrying on until the autumn.