Pearse Street and Tara Street train stations will be closed due to works this weekend.
DART services will run between Greystones and Grand Canal on the Southside, and Connolly and Howth on the North side of the line.
Dublin Bus will honour rail tickets for the duration of the maintenance, and also cover transfers for Rosslare Intercity passengers.
Irish Rail has apologised for any inconvenience caused.
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