covered by the wires. When the system was originally installed, any unsafe boulders below the screen were wired back to the screen. The Pass of Brander system covers the stretch of line from the 51 mile 72 chains point to the 55 mile 73 chain point, as measured from Callander. It was first installed in 1882 by the Callander and Oban Railway, following a derailment caused by falling rocks when a moving boulder actually struck a train, on 17 August 1881, a year after the line opened. It was then extended in stages up to 1913. A second derailment occurred on 8 August 1946, leaving the train perched on the edge of a drop. It happened to the 06:05 Oban to Glasgow train; the first the driver saw was the boulder falling onto the track, and was unable to stop the train in time. A third derailment occurred on 5 April 1997 at almost exactly the same site as the 2010 derailment. The guard on the train in 1997 was Angus McColl, who was also the guard in 2010. In the 1997 accident, the train remained upright and there were no reported injuries amongst the 40 passengers on board. On 11 October 2005, the locomotive of a freight train struck a boulder on the line between and , on the West Highland Line. The locomotive was not derailed but suffered damage sufficient to put it out of action. The stretch of line where the accident occurred was not protected by trip wires activating signals. On 11 June, Bob Crow, General Secretary of the RMT union, wrote to Network Rail criticising them for not implementing safety recommendations after a total of five previous derailments at Falls of Cruachan. Following the 1997 derailment, it was recommended that the embankment be stabilised above the line. Crow claimed that this work had not been carried out. Network Rail responded to Crow's allegation by stating that the cause of the accident was still under investigation by RAIB, and that it was their job to determine the cause, not the RMT's. Following the accident, vegetation clearance was undertaken and a number of rocks removed from the slopes above the railway as it was deemed that there was a risk of them falling onto the railway below. Investigation According to the British Transport Police the immediate cause of the derailment was thought to be that the train