without prejudice to Article 21(5) of Directive (EU) 2016/797, and before issuing an authorisation for the placing on the market of a vehicle equipped with an ERTMS on-board subsystem, advise applicants at their request, on the technical compatibility between ERTMS on-board and trackside subsystems;
gan dochar d'Airteagal 21(5) de Threoir (AE) 2016/797, agus sula ndéanfar údarú a eisiúint chun feithicil a chur ar an margadh a mbeidh fochóras ERTMS ar bord feistithe inti, comhairle a chur ar iarratasóirí arna iarraidh sin dóibh, maidir leis an gcomhoiriúnacht theicniúil idir fochórais ERTMS ar bord agus fochórais taobh riain;