Transport for Wales is reminding customers to check before they travel ahead of Wales’ biggest timetable change for a generation.

From 15 December, Sunday services on many parts of the network will look more like midweek services – with Sunday services introduced on some lines for the first time.

To accommodate the new services and shorter journey times, many services are being retimed with trains running several minutes earlier or later than normal, and longer or shorter connection times.

Customer delivery director Bethan Jelfs said: “We’re really keen to keep all our customers updated of the forthcoming changes, particularly those who have been catching the same service at the same time for many years.

“Please don’t assume you won’t be affected and the last thing we’d want is for you to miss your service or a connection by a couple of minutes.”

Head of operations for Network Rail Wales and Borders, Chris Pearce, said: “The December timetable change is the culmination of massive investment in rail infrastructure and new trains on the Great Western mainline. But there are changes right across our network that passengers need to be prepared for, including new Sunday services on some lines that have not received a Sunday service before.”

Find out how changes will affect you online or from your local booking office.