Vandalism partly closes Belfast's Yorkgate station
Passengers faced disruption after Yorkgate station in Belfast was "extensively vandalised" overnight.
A platform was closed and Belfast-bound passengers had to travel on to Central Station and change back to Yorkgate.
Windows were smashed and doors were damaged in the attack, along with alarm panels: Translink said the damage would be "costly to repair".
Translink said the ticket office was also targeted. Normal service resumed later on Thursday morning.
The train operator offered a £1,000 reward for information that leads to a successful prosecution.
"We have a zero tolerance approach to antisocial behaviour," it added.
Police said they had received reports the station had been "accessed overnight and ransacked" at 05:45 BST.
Officers were at the scene and have appealed for information.