RMT say a crack near Selby, due to staffing cuts, has crumbled to a much bigger gap.
RMT claim there is massive pressure from the Government to keep the East Coast Mainline running, as they look to re-privatise the service. They say there are also demands on Network Rail from the budget-holder, the Office of Rail Regulation, to cut back on rail renewals work.
More top news
Up to 600 homes in North Yorkshire have been left without gas after a main pipe "collapsed" during routine repair work.
Detectives are appealing for information after reports of gun shots in Huddersfield yesterday.
Cold Saturday. Frosty and icy overnight. Cloudier, wetter, windier yet milder for Sunday.