Oxford - Bletchley is pencilled in for re-opening (awaiting funding).
The study report, which concludes it has a positive business case is here
http://www.eastwestrail.org.uk/downloads/Atkins_east_west_transport_links_report_Mar06.pdf
The more interesting report discussing the options for track plans and train services is here
http://www.eastwestrail.org.uk/reports/documents/GRIPStage2Report.pdf
“Option A” – Base Case plus 2tph Aylesbury to Milton Keynes (Cost: Base Case +£64m)
double track from Aylesbury to Calvert South
double track from Verney Junction to Swanbourne
double track from Summit Junction to Denbigh Hall South Junction
single track elsewhere
“Option B” – Base Case plus 2tph Aylesbury to Bedford (Cost: Base Case +£64m)
same infrastructure requirements as for Option A
Hybrid “Option C” – Amended option A service pattern (Cost: Base Cost +£64m)
same infrastructure requirements as for Option A
W10 Gauge Freight Enhancement- (Cost: Base Case +£152m)
provides of 1 freight train per hour in addition to the “Base Case” option.
extra track Denbigh Hall South Junction - Milton Keynes Central.
double track throughout core East West Rail route, except through Wolvercot Tunnel where single track is retained.
100mph Inter-regional Cross Country - (Cost: Base Case +£98m)
reinstate chord at Bletchley to connect into WCML Down Fast line.
double track throughout core East West Rail route.
requires further timetabling work to prove suitable paths can be established.
The great central (including woodhead) has several re-opening schemes including here
http://www.central-railway.co.uk/
and here
http://www.translinkuk.com/index.html
and has been discussed several times with several TOC, including Chiltern and Arriva.