A new hourly train service on Sundays will be launched next month between Coryton and Penarth.
Transport for Wales (TfW) is introducing a number of changes to its timetables from Sunday 14th December, including more late night services on the Valley Lines.
There'll be a new early morning service from Mondays to Saturdays calling at all stations between Bridgend and Cardiff.
TfW says the new timetable will offer more options for travelling customers in the region and support the nighttime economy,
Transport Secretary Ken Skates said: "Railway connections are vital in driving prosperity. These changes will make a real difference to customers, who will benefit from more services across Wales and the Borders."
"This has been made possible by our £800m investment in brand-new trains for the Wales and Borders network."
The new Sunday service between Coryton and Penarth follows the rollout of new tri-mode electric trains during the summer.
On Friday nights, three later trains will run after midnight to Treherbert, Aberdare and Merthyr Tydfil, including a connection to Cardiff Bay.
TfW said it would make journeys home "simple and stress free", particularly for theatregoers at the Wales Millennium Centre.
The new 5.37am service from Bridgend to Cardiff, targeting early commuters, will call at all stations and extend to Ebbw Vale.

Vueling withdraws winter flights to Aicante this winter
Playground in Barry forced to close after fire damages equipment
Campaigners Take Fight for Fairer Pathways in Welsh Women’s Football to Parliament
Vale Councillor Gwyn John Launches His First Novel at Llantwit Major Book Signing
Pink poppy display commences with celebration of life
Former Barry office block converted into new homes for people at risk of homelessness
Welsh Government publishes independent report on Level 4 intervention at Cardiff and Vale UHB
Three CoastSnap stations set to be installed along the Glamorgan Heritage Coast
Daffodil Runner statue installed at Marie Curie Hospice in Penarth
Woman Dies After Incident in Leckwith as Police Investigation Continues
Vale entrepreneur wins national Innovate UK award for sustainable construction technology
Cardiff Airport retains top accessibility rating as regulator reports record demand for assistance
Open Doors event to showcase hidden world of Glamorgan Archives
New details have emerged of a new tree-lined public square that will replace a traffic dominated junction
Dyffryn Gardens’ Edwardian rose garden blooms again after decade-long restoration
Barry’s Own Daniel White to Walk 190 Miles Back to Where His Round Table Story Began
1,300 people attend Flying Start Family Fun Day
Dispersal order put in place to tackle anti-social behaviour
Interim Chief Executive Appointed at Cardiff and Vale University Health Board
Cardiff Theatre Marks 50 Years of Service for Long‑Standing Staff Member