Is four-tracking proposed through Shepreth Branch Junction? There are houses around the route immediately to the west that would make widening different, and unless six tracks were provided northwards there would still need to be a flat junction about where the existing one is. I believe it's only four tracks from the junction into Cambridge, in which case a double-track bottleneck remains between there and the new junction. This presumably eliminates Shepreth Branch Junction itself, but there will still be conflicts at the south end of Cambridge station to timetable in, and it may be hard to do this while also ensuring minimum conflict at the new junction.