I expect the desired service patterns will require revised junctions at the south end of Toton. There are already points in the area on the high speed line, associated with serving the multiple HS platforms there (four in number), and the proposal would see those junctions reconfigured to also create connections onto the conventional network. Such a south end connection could also allow Derby and Nottingham central stations to be served directly by rear portions from London detached from full length HS2 trains at Toton, and reversed to access their respective destinations. That could justify an island of further OHLE in this part of the East Midlands, where track remodelling has been completed recently and signalling renewals made wiring-ready. An OHLE island would also be of use for the bi-modes planned to operate on the MML, to reduce urban emissions, preserve off-wire range and reduce engine hours. Running from Leeds HS to Leicester and Bedford suggests these ought to be MML fast trains running on to St Pancras, and this favours completion of electrification throughout, if diesel bi-modes were not permitted on the new line, although I don't see why diesels on board should really be a problem in this area, as long as the trains were fast and powerful enough to keep up with the flow of London trains, and it will be a surface railway unlike the long London approach tunnels on the main trunk. If the gaps in wiring were small enough such that batteries could be capable of powering through them at normal operational speed, then an on-board storage solution might be appropriate rather than a diesel hybrid, and these shouldn't pose any problem from a safety point of view on the new railway. There might be some scope to tweak line speed downward a bit on this segment to better suit the potential traffic mix at maximum capacity with a number of regional expresses sharing the new infrastructure. The German-style 250kph intermediate speed might be appropriate, and there are quite a number of off the shelf European train designs with this ceiling, as it's a speed threshold in the TSI regime, above which more stringent design requirements and testing apply. Trains with this maximum speed can be lighter and more energy efficient than the ultra high speed designs, although those are also improving in this respect with their latest iterations.