Improvements will make the bridge safer, more reliable and in need of less maintenance in future.
The work means that on 9-10 and 16-17 March replacement buses will run between Preston and Blackpool South. The railway between Preston and Blackpool North will remain open at all times.
“I apologise for any impact the work will have and would like to thank passengers and local people in advance for their patience.”
Chris Jackson, regional director for Northern, said: “The Great North Rail Project is transforming the railway in the north of England and has provided Blackpool with significant improvements during the past 12 months. This latest phase of work is key to the ongoing improvements and future-proofing of our network in Lancashire.
“I’d like to thank our customers and other local people for their patience and understanding, and call on anyone planning to use Northern services on the affected weekends to carefully check timetables before they travel.”
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