<p>Investigators are continuing to search for the cause of freight train derailment in Victoria last week that forced the closure of the main Sydney-Melbourne line for almost a day.</p> <p>The Pacific National train, which was on its way to Melbourne, derailed about 4.45 am on Thursday (September 23) about 5 km north of Benalla.</p> <p>Four of the rear wagons, which contained cement, came off the track but did not spill their contents, a Pacific National spokesman said. </p> <p>However, there was a significant amount of damage to the track and ballast.</p> <p>Australian Rail Track Corporation (ARTC) crews worked around the clock to repair the track and services were restored about 3am on Friday (September 24).</p> <p>The Australian Transport Safety Bureau is investigating the incident.</p> <p>The spokesman declined to comment on what caused the derailment on the ARTC-controlled standard gauge track, saying that Pacific National is "co-operating with investigators".</p> <p>There is some speculation that train derailed when the rear wagon hit a soft spot in the track caused by recent wet weather.</p> <br />
