Train drivers have announced two more strikes as part of a long-running dispute with rail companies over pay.
The Aslef union said its members at 16 train companies would walk out on Saturday, September 30, and Wednesday, October 4.
And an overtime ban for drivers across the rail network will be in force on Friday, September 29, and from Monday, October 2, to Friday, October 6.
The strikes are expected to cause widespread disruption to GWR services and trains will not run on most of the GWR network on those days, including between Oxford, Worcester and Hereford, and between Worcester, Gloucester and Bristol.
Click here for the latest service updates from GWR and information about validity of pre-booked tickets for travel on these dates and how to get a refund.
These disputes will also affect services operated by West Midlands Railway and CrossCountry Trains.
No WMR trains will run on the strike days, while on the days when a work to rule is in force, there will be a reduced service between Birmingham New Street, Worcester and Hereford,.
CrossCountry will not operate any trains on the days of the strikes, while on the days of the work to rule, there will be a reduced service between Birmingham and Cardiff via Worcestershire Parkway and between Birmingham and the South Coast via Oxford.