First of all, in my memory, the train Hijacking de Punt happenend in the year my parents went to the Netherlands in 1973. A few weeks ago, I was talking to someone who told me it happened in 1975.
Jan Beckers, Freelance Research/Investigative Journalist, started looking in to the Hijacking case in 2010. He is being threatened by i.e. the marines who were involved at De Punt in 1977.