Beth yw'r dyddiad cwblhau disgwyliedig diweddaraf ar gyfer cwblhau'r gwaith ar linellau craidd y cymoedd yn llawn, gyda'r trenau metro newydd yn cael eu defnyddio?
Wedi'i ateb gan Y Dirprwy Weinidog Newid Hinsawdd | Wedi'i ateb ar 22/01/2024
Transport for Wales expect to complete the majority of the works to the Core Valley Lines in 2024, enabling new trains to operate services to Treherbert, Aberdare and Merthyr Tydfil later this year. New trains are already operating on the Rhymney line. Some infrastructure improvement works will continue on the Core Valley Lines beyond 2024 to enable future service enhancements.