The GCR was built to allow quadrupling Peter, but not much was. It came too late. The astonishing thing about where it crosses the Midland route in Nottingham is that it passes directly over the station, which is huge, on a low bridge at rooftop height. The other big problem in Nottingham is that Nottingham Central station was in a deep cutting with a twin bore tunnel at either end. That land is now a shopping centre. There are also obstacles at Chesterfield and to the North towards Sheffield where roads are built on the route, but nothing would be insurmountable. And of course this route links up to the Woodhead Sheffield - Manchester route which should never have been closed either.
