Northern Commuter trains are operating from Dundalk/Drogheda to Malahide.
Irish Rail said emergency services attended the scene at Howth Junction when an out-of-service Dart heading north to Malahide struck and fatally injured a person on the line at Howth Junction. "Delays remain but will ease", the rail operator said.
There are no Dart services operating between Malahide/Howth and Harmonstown.
Dublin Bus is accepting rail tickets, although users are being warned that additional demand on bus services is expected to cause capacity issues.
Irish Rail said: "These arrangements are likely to continue throughout the morning peak".
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The disruption affected commuters throughout this morning's peak times.
There is disruption to rail services this morning following an incident in Dublin.
"It would not be unusual for the line to be closed for two, two-and-a-half hours", he said.
Belfast Enterprise services, meanwhile, will have bus transfers between Dublin Connolly and Drogheda.
"We apologise to customers but the circumstance is a tragic one, and the disruption is unavoidable".