The Peak District has always been a formidable barrier to transport links across it, particularly railways. The first crude horse-drawn tramways fed canals on its eastern and western flanks, but in 1830 - only five years after the Stockton & Darlington Railway opened - a standard gauge line climbed over the top of the Peak District and down the other side on fearsome inclines to connect canals at Cromford and Whaley Bridge. Sheffield and Manchester...