Three extra trains to run between Bristol and Cardiff on Sundays
Three additional Sunday train services are to run between Bristol Temple Meads and Cardiff Central.
Leaving from Bristol, the services will call at Filton Abbey Wood, Severn Tunnel Junction, Newport and Cardiff.
The three services will depart at 08:48 GMT, 10:48 GMT and 12:48 GMT from 21 December.
First Great Western's Mark Youngman said the train operator was "delighted" to offer the extra services in response to passenger needs.
Chair of the Severn Tunnel Action Group David Flint stated that passenger numbers had risen by over 5% in Cardiff.
He added: "This is great news for passengers and will allow those working in Cardiff on a Sunday morning even more opportunity to catch the train."