The mother of a man killed in the Potters Bar rail crash has told of her frustration that no criminal charges will be brought over the derailment.

Diana Fischer-Schickler said the bitterness she felt over the fact no one had been held accountable for the death of her son, Jonael, returned every time she saw the crash mentioned in the news.

The Crown Prosecution Service ruled yesterday that no criminal proceedings would follow the May 2002 crash because the evidence did not provide "a realistic prospect of conviction for an offence of gross negligence manslaughter against any individual or corporation".

Mrs Fischer-Schickler, 57, of Highgate Road, Forest Row, said: "I am not surprised because we knew this was going to happen.

"But I feel such anger that after all this time and money spent collecting so much evidence the police still aren't able to say what actually happened or pin it on anyone.

"Knowing that no one has admitted responsibility is so hard."

Mrs Fischer-Schickler's son was a 25-year-old high-flying Cambridge graduate when he died.

He was the youngest victim of the accident, which was caused by loose nuts on a set of points in Hertfordshire on the King's Cross to King's Lynn line.

Mrs Fischer-Schickler said the hardest thing to deal with was knowing no one had admitted responsibility for the deaths.

She said: "I wouldn't want to see one individual prosecuted such as a man who didn't tighten the bolts.

"It was the corporate structure itself, which put profit over safety, which was to blame.

"The privatisation of the railways meant the maintenance of the tracks was done by someone separate to the people that built them and there was not one person looking after each section of track like there used to be.

"That is why this came about and why there has been such a large number of accidents in such a short space of time.

"There needs to be proper corporate manslaughter laws put into place."

Network Rail as well as Jarvis - the company doing the maintenance at Potters Bar - could still face charges under health and safety laws.

But no individual will be prosecuted for causing the deaths of seven passengers because there is not enough evidence of specific and substantial negligence.

Mrs Fischer-Schickler is also pursuing a civil action, suing the two companies for £100,000.

Network Rail said: "The Potters Bar rail crash was a tragedy for all involved for which the industry is truly sorry.

"We note the announcement from the Crown Prosecution Service and we continue to co-operate with the Health and Safety Executive with all its inquiries.

"Over the last three years there have been many changes on the railways.

"Network Rail, a not-for-dividend company, took over from Railtrack in 2002.

"Maintenance has been taken in-house, restoring the link between ownership and upkeep of the rail infrastructure."