Emergency repairs to a bridge damaged by a burst water main will impact road and rail travel south of Bolton for several weeks.
A burst water pipe caused a section of Moses Gate bridge to collapse onto the railway below and created a hole in the road above on Thursday 17 August.
Major engineering work is needed to make the bridge and highway safe before both the road and railway can be reopened.
The work means the railway line between Bolton and Manchester will remain closed next week and it is anticipated a reduced train service will be in place for the following four weeks. The road could be closed for up to six weeks.
The railway through the area has been closed because of upgrade work at Bolton station as part of the Great North Rail Project. The station and railway between Bolton and Manchester was due to open on Monday (28 August). Work at the station is still scheduled to be completed as planned.
Trains will still run from Bolton to Blackburn and Clitheroe.
Passengers are being urged to plan their journey ahead and check before they travel at www.nationalrail.co.uk.