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
Mainly dry. Light rain out of thicker cloud over hills. Breezy at times and cooler than average
A look ahead at the forecast for the Border region.
Pictures from the commemoration marking the centenary of the Quintinshill rail disaster, which killed more than 200 people, is underway.