Thousands of rail travellers are experiencing disruption today and will again tomorrow due to a strike at Iarnród Éireann.
No rail services apart from the Luas in Dublin will run - due to a two-day stoppage in a row over pay cuts.
No Intercity, DART or commuter trains will run - although Enterprise services will operate between Newry and Belfast.
Further strikes are planned for 7 and 21 September.
These dates will coincide with the All-Ireland Hurling and Football finals.
Unions say these dates were chosen to minimise the impact on people travelling to work and school.
People travelling to the match at Croke Park may avail of buses being provided by private bus services.
The Samuel Beckett Bridge will also be closed until midnight tonight, it is reported that a music video is being filmed there.
AA Roadwatch have warned people that there may also be delays around Newlands Cross due to roadworks.
There is also a marathon taking place in Longford Town.