Network Rail has said that rail services between Bolton and Manchester are not likely to resume until next month after a burst water main triggered a cutting failure.
The soil nailed slope failed and part of the bridge collapsed causing debris to fall onto the rail lines after the water main burst flooded the area last week.
The rail line was closed as part of the upgrade work at Bolton station when the incident occurred but rail services were set to restart on Bank Holiday Monday.
Network Rail has said that services will remain suspended for at least a week but it hopes to resume a limited service for the remainder of the repair work, which is expected to take six weeks.
“We are working round the clock to repair the damaged bridge and get train customers and road-users on the move as normal through this area,” said Network Rail senior sponsor Andy Morgan.
“Repairing the water-damaged bridge is a complex engineering challenge requiring a bespoke design.
“We are working closely with Bolton Council, Transport for Greater Manchester and United Utilities to safely carry out the repairs so the railway line and the road can be reopened as quickly as possible.”