Local train services will be affected by engineering works over the Christmas and New Year holidays.
Network Rail will be carrying out essential works to the west of Cardiff Central station from Christmas Eve until New Year's Eve.
Transport for Wales (TfW) says some services may be retimed and subject to platform changes.
There'll be no trains on Christmas Day and Boxing Day with services finishing early on Christmas Eve and starting later next Saturday (27th December). There'll also be an early finish on New Year's Eve.
On New Year's Day, there'll be a reduced hourly service on the Vale of Glamorgan line via Barry - and no services to and from Penarth and Cardiff Bay. Trains will also not call at Barry Island but a full service will run on the South Wales mainline.
Marie Daly, TfW's chief operating officer, said: "With essential engineering work taking place, planning ahead has never been more important."
"Our dedicated teams will be working throughout the festive season to keep services running across the Wales & Borders network and get passengers safely to their destinations."
All services to and from the west of Cardiff Central will call at all stations where possible and divert via Ninian Park.

Police given additional powers to deal with anti-social behaviour in Barry
Senedd passes supplementary budget with £60m boost for additional learning needs
Future of planned festive events in question after criminal damage to Barry Town Hall
Consultation to open on plans for 35MW solar farm near Penarth
No Trains through the Vale of Glamorgan this Sunday
Police and Cardiff City launch operation to tackle matchday anti-social behaviour
Free leaf and fallen fruit collections return in the Vale
Barry retains Fairtrade Town status until 2029
£1m improvements planned for Pencoedtre Park as splashpad work set to begin
Plan submitted for new independent school on site of well-known charity farm
Is your hot water bottle safe?
Solicitor sentenced for defrauding Cancer Research UK
Cate is crowned champion!
WATCH: Winner of The Voice UK Cate McHugh duets with Sir Tom Jones
Barry filmmaker takes her documentary to the big screen in New York
Pupils leave their mark on new school at steel signing event
£3m refurbishment plans revealed for Cowbridge Town Hall
Penarth RNLI shop volunteers recognised for decades of service
Cardiff’s National Museum in need of £46m for urgent repairs, says Amgueddfa Cymru chief executive
Future of Colcot and Buttrills sports facilities outlined after consultation