All rail services in and out of Dublin's Heuston Station were suspended following an incident on the tracks on Monday evening.
Iarnród Eireann reported an incident involving a train in the Parkwest area.
The incident is understood to be a personal tragedy.
They informed passengers that all train services were suspended as a result.
Gardaí and emergency services attended the scene and the tracks were closed from 6.30pm until 11pm.
Iarnród Eireann said they could not move any services as the site was under the control of the emergency services.
Passengers tweeted from the scene, with one writing; "3 fire brigades, an ambulance 4 or five garda cars all on scene now [sic]."
Iarnród Eireann kept customers up to date on their official Twitter page as all services operated through Adamstown with bus services to Heuston for the evening.
The line reopened at 11pm. Iarnród Eireann confirmed all services will operate as normal on Tuesday morning.
The 17:20 Galway to Heuston and the 17:20 Cork to Heuston are moving to Adamstown Station, Lucan. Customers are told they can either remain on board or take Dublin Bus from Lucan.
Furthermore, the 19.35 Heuston to Galway and the 21.00 Heuston to Cork will start from Adamstown. Customers will be bussed from Heuston to Adamstown.
Customers can expect a 30-minute delay as a result, a spokesperson said.
In a final update, Irish Rail said the remainder of all services from Heuston will depart from Adamstown tonight.
All services will operate as normal from first service in the morning.
If you have been affected by the issues raised in this article please contact the Samaritans on 116123 for support or visit the website on www.samaritans.org.
Pieta House can be contacted on 1800 247 247. For more information on Pieta House and its services visit www.pieta.ie.