That line twists and turns through County Durham and then make a couple of even sharper looking turns before they approach Durham city. Then after Durham there is another particularly wheel scraping corner before Chester-le-Street. It's not exactly crawling speed, but it's not overly fast either. What makes it worse is the A1(M) motorway passes along the same corridor on a much straighter alignment. It's a pity when that motorway was being built the opportunity wasn't taken to realign the ECML alongside it. Although accessing Durham will always require that dog leg route after Ferryhill.