The service has been halted while the line is repaired
The train service between Belfast and Dublin has been halted by a collapse in the line at Malahide in north Dublin.
The incident happened on Friday evening on the viaduct across the estuary north of Malahide.
Iarnród Éireann said "quite bad" damage to the line had been caused by subsidence at an embankment.
The damage was spotted by a train driver travelling from Balbriggan to Dublin. His train had passengers on board but he managed to stop.
Arrangements are being made for passengers to be transferred by bus.