The court case begins today. It's because of the company's failure to provide and implement suitable and sufficient standards, procedures, guidance, training, tools and resources for the inspection and maintenance of fixed stretcher-bar points.
The rail regulators prosecution follows the conclusion of its investigation into the derailment of the Virgin Pendolino passenger train, and the completion of the coroner's inquest into the death of Mrs Masson.
On 23 February 2007, the 17.15 Virgin Trains service from London Euston to Glasgow Central derailed on the West Coast Mainline near Grayrigg in Cumbria. 109 passengers were on board. One passenger, Mrs Margaret Masson, was killed. 86 people were injured, 28 seriously.
More top news
Do you know what's been happening in Cumbria and the south of Scotland over the past seven days? Test yourself in our weekly news quiz.
The 14-year-old's body was found in a cemetery in Carlisle last June. George Thomson and Brahnn Finley have been found guilty of murder.
Cumbria Fire Service is reminding families of how easy pan fires can start and give their tips on how to handle one.