A yw'r gwaith o adeiladu'r holl drenau newydd sydd eu hangen ar gyfer llinellau craidd y cymoedd wedi'i gwblhau, ac a ydynt yng Nghymru ac yn barod i'w defnyddio?
Wedi'i ateb gan Y Dirprwy Weinidog Newid Hinsawdd | Wedi'i ateb ar 07/02/2024
48 trains for the Core Valley Lines have been manufactured and are in Wales. Four trains have been manufactured but are not yet in Wales. 19 trains are still being manufactured.