From
the BBC» Wales' train operator has been accused of "empty words" after failing to enforce social distancing rules.
Arfon MP▸ Hywel Williams said Transport for Wales (TfW) had pledged to make the safety of customers an "absolute priority".
However, he said the rail service then issued guidance to staff telling them not to enforce social distancing rules.
TfW said that as passenger demand increases, social distancing "will not always be possible" during busy times.
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He said it was important passengers planned ahead and made "responsible decisions" on their need to travel.
But Mr Williams said: "Expecting ticket-paying travellers to cram into overcrowded trains is unacceptable under normal circumstances, but to allow those conditions when Covid cases are on the rise is totally irresponsible.
"TfW and the Welsh government must urgently reassess their guidance so that staff, as well as passengers, are protected as journeys increase over the summer."
Nia Jones, who lives in Mr Williams' constituency of Arfon, also called for action after describing a trip from Crewe to Bangor as "an extremely uncomfortable experience".