"At 1000 an area controller on the Revesby panel at Sydney Trains' Sydenham Signal Box handed over to a relief area controller. During this handover, the limits of a planned Local Possession Authority (LPA) on the Up Main line between Revesby and Turella were discussed. However, both area controllers incorrectly assumed the limits of the LPA were at the City end of Revesby (clear of No 51 points) rather than the Country end (clear of No 55 points) and blocking facilities were applied. At 1020 the LPA was formally granted. At 1050 passenger train 709C traversed No 55 points and entered the possession area on the Up Main line and immediately ran over railway track signals (detonators) and was brought to a stand. There were no reports of injuries, or damage."
Trains 707D and 709D from Macarthur to the City were said to be involved.