Rail passengers using services between Blackpool and the south of England are set to face delays later this summer while an £18m improvement scheme takes place.
The work will take place over a nine day period between July 13 and July 21, meaning the line will be closed between these two dates.
Network Rail says trains will be able to travel faster along the track as a result of the improvements.
Train operators will announce alternative arrangements for passengers during the works shortly.
Dyan Crowther, Network Rail’s route managing director, said: “This scheme represents significant investment in the railway in this area to increase line speeds and make the railway more reliable and punctual for our customers.
“There is never a good time to carry out major work on such a busy route and after careful discussion with the train operators and industry partners, it became apparent that undertaking this vital investment in nine consecutive days in July would, overall, cause less disruption.
“Train services are quieter at this time and fewer people are expected to experience changes to their travel plans compared to the work being staggered over the next two years, impacting on dozens of weekends and Bank Holidays.