Iarnród Éireann operates additional services for Robbie Williams show and college football match as price of a double room hit €650 a night

Oasis fans in Dublin for last weekend's gigs at Croke Park. Photo: Collins

Oasis fans in Dublin for last weekend’s gigs at Croke Park. Photo: Collins

Visitors who go to Dublin for big events are hopping on the train back home instead of paying “extortionate rates” for hotel rooms.

As Robbie Williams played in Croke Park last night and thousands of American football fans descended on the capital, prices had shot sky-high again, with 95pc occupancy in Dublin by Friday, one booking site showed.