Rail transport services in 2020-21 (1 April 2020 to 31 March 2021) were significantly affected by the coronavirus (COVID-19) pandemic.
Effeithiwyd yn drwm ar wasanaethau trafnidiaeth ar y rheilffyrdd yn 2020-21 (1 Ebrill 2020 i 31 Mawrth 2021) gan bandemig y coronafeirws (COVID-19).