The inclusion of lines such as Leicester-Burton and extending Birmingham Cross-City to serve Alrewas illustrate well just how complex re-openings of branches closed during the Beeching era can be.
Extension of the Cross-City service north east from Lichfield Trent Valley through a reopened station at Alrewas (to serve the National Memorial Arboretum) and then on via Burton to Derby is, on the face of it, a no brainer; there is a substantial commuter flow into Derby from places like Sutton Coldfield, and this has to be by car along the A38. When I was at work, I knew of quite a few people employed at Bombardier who made this daily commute, and I understand from friends and acquaintances who worked at Rolls Royce that there was a similar situation there; the Bombardier works is about 15 minutes walk from Derby Midland station, and the main Rolls Royce civil aerospace facility is a similar walk from Peartree station (which could be served by extended Cross-City services}.
If, say, two Cross City trains each hour were extended north east from Lichfield to Derby, Wichnor Junction could probably cope ok with the conflicting movements of two trains heading towards Birmingham crossing four XC services heading towards Derby; but when Burton is reached, if the Ivanhoe line project is taken forward one train off the Leicester line would have to cross over six heading to towards Wichnor. Then at North Staffs Junction, one heading towards Crewe from Derby would have to cross over the paths of seven heading towards Derby, whereas there are only four at present. Then what happens when you get to Derby?
After December 2020, the number of trains reversing at Derby each hour will increase from four to six; could a Leicester - Burton - Derby service still be accommodated in the north end of either platform 3 or 4? But I guess it would be difficult to terminate the two extended Cross City trains in any of platforms 1 - 4; possibly, therefore, a new platform 0 would have to be constructed - this could probably be done quite easily at the London Road Junction end of platform 1, where part of an abandoned goods or parcels platform currently stands.
Then the following December, the terminating service from Norwich will have to be accommodated; this might be possible in the northern end of either platforms 3 or 4, but if that does happen, could the Leicester - Burton - Derby still be accommodated? Would, therefore, platform 7 have to be bought into use for regular passenger train services?
Matlock - Buxton/Chinley has also been suggested; I guess extending the Nottingham - Matlock through to Buxton would be "easy" and could be done without taking any paths on lines already open; but could the Norwich - Derby service be extended through the Peak District to Manchester? Would it go via Buxton or Chinley? And if via Chinley, would it then have to go via New Mills because of congestion at Stockport? How much of a negative impact would going via New Mills have upon revenue because Stockport has been missed? And could the junction at Ambergate cope with two trains from the Matlock direction crossing over four going north towards Chesterfield? Would it be necessary to construct a new loop on the Matlock branch between Matlock and Whatstandwell to provide added flexibility whenever there are perturbations on the MML or congestion in the Manchester area?
These all add costs and need to be taken into account when considering re-openings; nice soundbite from Grant Shapps, but potentially very difficult - and expensive.