Police are appealing for public assistance after rocks were left on rail lines near Newcastle recently.

Just after 5pm on Sunday (17 May 2015), a freight train struck a large rock while travelling on the main line between Wyee and Warnervale railway stations.

The train was not damaged.

A short time later, a passenger train struck rocks on the same tracks and sustained significant damage.

No passengers were injured; however the train was rendered inoperable.

About 5.30pm on Monday (18 May 2015), another passenger train struck rocks on a different track between Wyee and Warnervale stations.

The train was also damaged and rendered inoperable.

Police were alerted and officers from the Police Transport Command are investigating all incidents.

It’s believed the rocks were deliberately placed on the tracks.

Investigators are appealing for anyone with information, or who may have seen suspicious activity on the railway lines, to come forward.