Why were two rail companies fined?

(27[D])Two rail companies were fined a total of ￡325,000 yesterday for "an unsafe system of work practices" that led to the death of a 22-year-old student.
     Michael Mungovan, studying at Brunel University, was working a night shift with a track maintenance crew near Vauxhall station, south London, in October 2004, when he was struck from behind by an empty train and killed.
   (28[A])The court was told that Mr Mungovan had been given only minimum training. He had worked a few shifts, but never on a live running line.