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In page Ribble Valley line:

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Though the above enhancements have yet to come to fruition, Network Rail has carried out £14 million of improvements to track & signalling either side of Darwen station in July & August 2015. A six-week engineering blockade saw the existing passing loop there extended by 1 mile (1.6 km) at each end and signalling improvements made to add capacity on the line and allow for service frequencies between Bolton & Blackburn to be doubled to two trains per hour each way throughout the day from December 2017.[7][8] The work was completed on schedule and the line reopened on 24 August 2015.