Passengers are facing "severe disruption" to Arriva Trains Wales rail services on Sunday due to unofficial industrial action.
Drivers' union Aslef said it was not supporting the action over pay.
Services cancelled include trains to Cardiff from Treherbert, Merthyr Tydfil, Aberdare, Ebbw Vale, Barry, Penarth, Bridgend and to Manchester. Arriva Trains Wales apologised and advised people to make alternative arrangements for any essential travel.
Human resources director Dennis Baker said: "This action is unofficial and is not supported by the drivers' union, Aslef [...] Discussions with trade union representatives over the outstanding pay negotiations for train drivers are ongoing."
A spokesman for Aslef confirmed the union are not supporting the action.
Comments
I think that this wild cat
I think that this wild cat strike thing may have the potential for Trade Unionist to breach the Law and I sense a new conference among workers!