The rail union - the RMT - says there's a risk of another rail tragedy - after a six inch gap was found in the track on the East Coast Mainline near Selby.
The crack - says the union - is bigger than the one which caused the Hatfield rail crash in 2000 - when a train from London to Leeds derailed. The RMT claims government pressure on Network Rail and staffing cuts are to blame. But the company says no one's safety was put at risk. David Hirst reports.