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
50-year-old Tyrone Glaister has been jailed after stabbing a man in a Whitehaven pub with a hunting knife.
A father and son from Jedforest Hunt have denied breaking Scotland's fox hunting laws, after a video showed a fox being chased by hounds.
Angela Laskey was found with multiple stab wounds in an apartment in Santa Barbara in 2014.