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Dublin finally got a half decent map of just the rail services together last summer. Coverage is pretty poor for the service relative to a lot of cities its size, particularly on the northside of the city and the southwest. The only line that has a half decent service is the DART on the coast which is the only electrified service on the island. Some commuter lines go to suburban towns, while some are in the city limits. The DART and commuter services all share the same track in the city centre, which causes frequent delays to all the services, particularly in the last few months with a tunnel reopened north of Heuston to extra commuter traffic on the south western commuter line to go onto the city centre line instead of Heuston. This line is also the only one with some extra tracks for intercity services.
There's also two tram lines which are disconnected, but the connection to join them and one commuter line is expected to finally open in December. This will probably be the only interchange on the network that isn't from the city centre line to another line or Connolly-Heuston on the Luas. The interchange with the commuter line will be pretty useless until they increase capacity on this line.
Most projects which were planned to replace buses in rail deficient areas and to increase capacity on the existing network were cancelled or put on hold long term.