The train involved was a refurbished Class 303Electric Multiple Unit.[2] The concrete blocks were cable-trough covers, which were placed across the rails of the single-track line by two vandals who had climbed down to the railway to urinate on their way home.[4] The railway at this point is on a curve, going to the right as the train was travelling.
The leading bogie of the EMU derailed and the train immediately collided with the solid structure of the overbridge,[5] crushing the driver's cab, killing driver Arthur McKee, 35, and also killing passenger Alan Nicol, 21, who was seated immediately behind the cab, with his back to the partition.[6] Alan Nicol had taken this location to reduce the risk of injury from broken glass should the train be stoned by vandals, which was a common occurrence in that area. Including the two trainstaff, the train was carrying six people.[7]
Following the tragedy, many youths in the surrounding area were questioned by police regarding the incident.[6] After a trial by the High Court, Gary Dougan and Craig Houston, two 17-year-olds from Greenock were each imprisoned for 15 years for culpable homicide.[8] Dougan and Houston launched an appeal against their convictions two years later. In September 1996, the Court of Appeal in Edinburgh upheld both convictions.[9]
‡ indicates railway accidents and incidents resulting in at least 20 fatalities § indicates the deadliest railway accident in British history 1815–18992000–present