Ymhellach i WQ90460, a yw'r holl drenau trydan newydd sydd eu hangen ar gyfer lein Treherbert yn barod ac ar gael i'w defnyddio ar hyn o bryd?
Wedi'i ateb gan Y Dirprwy Weinidog Newid Hinsawdd | Wedi'i ateb ar 29/01/2024
All 24 Class 756 trains that will be used on the Core Valley Lines, including on the Treherbert Line, have been delivered and are currently being tested as planned.