A 2008 paper, 'Delivering a Sustainable Transport System' identified fourteen strategic national transport corridors in England, and described the LondonWest MidlandsNorth West England route as the "single most important and heavily used" and also as the one which presented "both the greatest challenges in terms of future capacity and the greatest opportunities to promote a shift of passenger and freight traffic from road to rail". They noted that railway passenger numbers had been growing significantly in recent years—doubling from 1995 to 2015—and that the RugbyEuston section was expected to have insufficient capacity sometime around 2025. This is despite the WCML upgrade on some sections of the track, which was completed in 2008, lengthened trains and an assumption that plans to upgrade the route with cab signalling would be realised.