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
Paul Brand and guests discuss hard Brexit - and party discipline.
Milder - but at a price.
Volunteers from Lauder and Whitsome have been nationally recognised for their work 'to clean up and green up' spaces in their communities.