Irish Rail has suspended its services between Connolly and Drogheda following a "tragic incident" on one of the lines.
An alert was put out at 2.30pm on Monday afternoon to the public about the incident.
Emergency services remain at the scene in Donabate.
An Irish Rail spokesperson has said that "Northern Commuter/Enterprise services are suspended until further notice between Drogheda and Connolly. Emergency services are attending to a serious incident on the line.
"Enterprise expected to operate with bus transfers Connolly - Drogheda. Enterprise expected to operate with bus transfers Connolly - Drogheda"
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If you or someone you know has been affected by the issues raised in this article please contact:
Samaritans helpline 116 123
Aware helpline 1800 80 48 48
Pieta House on 1800 247 247
