Vandals who littered a Co Londonderry railway line with wooden planks and metal bars - yards from the spot where a pensioner was killed in July - could have caused carnage, the dead man's brother said today.
Police today also branded the incident as "callous", warning that the potential consequences were "all too obvious".
Meanwhile, a lorry driver has also been spotted trying to dodge an oncoming train by nipping through a crossing.
Police are investigating an incident in which debris was left on the railway line at Myroe - just one stop from where Jim Craig met his death - forcing the train driver to screech to a halt.
Dr Tom Craig, Jim's brother, called the stunt " unbelievable".
"The only good thing that came out of Jim's death was the fact that no passengers on the train were injured," he said.
"The reports on train crashes in England this week showed how just one thing out of place or one small item on the track can derail the whole thing.
"Young people get up to all sorts of things these days and probably thought it was a bit of a prank, but passengers could have been killed."