Pa ddata y mae'r Prif Weinidog wedi cyfeirio atynt sy'n cefnogi ei honiad yn y Cyfarfod Llawn ddydd Mawrth 12 Mawrth mai Network Rail oedd yn gyfrifol am hanner y filiwn o funudau o oedi gan drenau Trafnidiaeth Cymru y llynedd?
Wedi'i ateb gan Prif Weinidog | Wedi'i ateb ar 20/03/2024
Data published by the Office of Road and Rail Statistics shows that Network Rail were responsible for almost half of the delays to Transport for Wales services in 2023 by causing nearly 460,000 minutes of delay.
Source: Table 3184 - Delay minutes by operator and cause (periodic) | ORR Data Portal (Period 11 2022-23 to Period 10, 2023-24).