Train passengers in the West of England have been warned to expect disruption on the railways on Sunday due to “crew availability”.
Great Western Railway (GWR) said fewer trains would run on a number of routes and that those that do run are likely to be busier.
Those travelling between Bristol Temple Meads and Gloucester or Bristol Temple Meads and Taunton should check their journeys before they travel.
Service between Westbury and Portsmouth or Weymouth may also be cancelled, and also those between Reading and Gatwick and Reading and Basingstoke.
GWR apologised for the disruption and said it would run a limited rail replacement bus service “where possible”, along some of the routes affected.
The company added that due to the complexity of updating timetable systems, journey planning apps are unlikely to show the changes until Sunday morning.
Those who have already booked a ticket but decide not to travel can claim a full refund from the GWR website.