Transport for Wales has worked to improve the bilingual services provided to customers using rail services in Wales since becoming responsible for the services.
Mae Trafnidiaeth Cymru wedi gweithio i wella'r gwasanaethau dwyieithog a ddarperir i gwsmeriaid sy'n defnyddio gwasanaethau rheilffyrdd yng Nghymru ers dod yn gyfrifol am y gwasanaethau.