Jurors at Woolwich Crown Court found Kevin Rees guilty of one count of causing an explosion likely to endanger life.
The Scottish Child Abuse Inquiry found children were sexually, physically and emotionally abused from the 1950s onwards at the Edinburgh school.
The train crashed at Carmont near Stonehaven on August 12 2020 after it hit a pile of gravel washed onto the track by heavy rain.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results