Pa gyfran o deithiau trên yng Nghymru sy'n cael eu gwneud ar hyn o bryd gan drenau newydd, yn benodol gan drenau dosbarth 197, dosbarth 230, dosbarth 231 a dosbarth 756?
Wedi'i ateb gan Y Dirprwy Weinidog Newid Hinsawdd | Wedi'i ateb ar 11/10/2023
Transport for Wales (TfW) has accepted a number of Class 197, 230, 231 and 756s and these will be introduced into service as they complete testing and when the new Core Valley Lines infrastructure opens. TfW reports that currently 29% of its services are being operated with new trains.