Airedale line
According to SELRAP, the Airedale line is the most heavily used passenger route outside the South East of England.In 1994 under Regional Railways, the line was electrified at 25 kV AC overhead between Leeds and Skipton,[2] and new British Rail Class 333 trains were introduced in the early 2000s.[3] New stock and longer trains were introduced by the former Northern franchise Arriva Rail North in 2019 to tackle this issue.Because of the difficulty of lengthening platforms at Shipley, it will be hard to introduce longer trains (i.e. 5 or 6 carriages) as was proposed on the neighbouring Wharfedale line.[8] A 2008 report by Modern Railways claimed that a solid hourly service would operate on the line as far as Long Preston, but would serve Carlisle and Lancaster alternately.