Kettering to Corby is mainly 90mph with sections of 60, and a bit lower around Corby itself. Corby to Manton Junction is a mix of 60 and 40mph with sections down to 20mph at places.Question:- The Kettering-Corby line has a half hourly service (360s) and line speed is quite good, however the section north of Corby to Manton Jct only sees a sparse passenger service (much freight though) so presumably hasn't been upgraded? What's the max line speed on the Corby-Manton Jct section? Some passenger services were diverted this way a few weekend's ago with reversal at Leicester with about 40 min extra journey time added.