They could. Certainly Cork to Bandon anyway, and a Luas from Ballincollig into the city and in out towards the airport / Douglas area.
Senior had relatives near Birr - and knowing him, cycling there from Birdhill wouldn’t surprise me at all, as he would sometimes cycle from Ranelagh to Liffey Junction or Inchicore, or occasionally to Clondalkin. On one occasion he got the train from Amiens St (having cycled there from Ballsbridge!), to Goraghwood, and thence to Warrenpoint. Then he cycled through Rostrevor, Annalong and Kilkeel to Newcastle. Then he threw the bike in the guards van and footplated an 0.6.0 to Belfast!