Lee Wasnidge from Northern rail explained to ITV Border why they felt it necessary to close the viaduct at Cummersdale in north Cumbria. The move has caused disruption to rail services between the city and west Cumbria.
The Viaduct already had scaffolding on it for routine maintenance and so that it could be painted.
Inspections will be carried out to determine if it is safe to ropen the viaduct this week.
More top news
A look ahead at a lively start to the weekend
The 7th Harley Davidson Wake the Lakes Festival is underway.
Concerns about the safety of the hospital's PFI building have been raised by the NHS Trust. The fire service says improvements are needed.