Another four-day strike by First Cymru bus workers will go ahead on Wednesday, the Unite union has confirmed.
Services to and from Llantwit Major will be among those affected in an ongoing row over pay.
Locally, First Cymru says services linking Llantwit Major with Bridgend (303), Cardiff (304) and Talbot Green (321) are unlikely to run while there'll be a reduced timetable on the X2 service between Porthcawl and Cardiff via Bridgend.
Last week, Unite accused the bus operator of continuing to short change staff - with the union threatening to stage further action over the Christmas period.
General secretary Sharon Graham said: "First is guilty of trying to deny workers the back pay they are fully entitled to, in order to line its own pockets."
"Our members have roundly rejected this latest offer, which denies them pay justice and they have Unite's complete support throughout this dispute."
Doug Claringbold, First Bus' managing director in Wales said: "Throughout this extensive negotiation process, we have listened to Unite the Union member feedback and made a number of offers in order to try and settle this dispute, to ensure customers who rely on our services are not affected by strike action."
"Unfortunately, rather than work with us to find a resolution, Unite the Union has decided to press ahead with strikes, affecting our customers. Our door remains open to negotiation."
Other affected services include the 64 (Bridgend - Talbot Green) and 320 (Talbot Green - Cardiff) routes/
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