Derailment means road and train line could be closed until next week
Engineers say road may have to be strengthened to allow crane to lift wreckage.
The main road and railway leading from Glasgow to Oban could be closed until the start of next week following Sunday's train derailment.
Engineers on the site near the Falls of Cruachan may have to strengthen the road in order to get a crane in to lift the wreckage.
Two boulders on the tracks are thought to have caused the accident in which no-one was hurt. It is understood the rocks fell onto the track following a landslide.
On Monday the train's driver Willie Dickson, 60, described how he hit the vehicle's brakes after seeing “two huge rocks” on the track at the Falls of Cruachan by Loch Awe in Argyll on Sunday night.
The father of two from Grangemouth said: "I stayed at the controls until the train came to rest. I then entered the front carriage and tried to calm passengers down before taking people by the hand and leading them off the train."
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A replacement bus service is operating directly between Oban and Glasgow Queen Street and there are also buses from Crianlarich to Oban via Ballachullish.
ScotRail is assisting the Rail Accident Investigation Branch and other agencies in understanding the cause of the landslip and its effects.