Page 17 of Network Rail’s December 2017 update to its enhancement project sets out the revised scope of phase 2 of east West Rail (Bicester to Bedford etc)
https://cdn.networkrail.co.uk/wp-content/uploads/2017/12/Enhancements-Delivery-Plan.pdf
Upgrading the existing Bicester Village to Bletchley freight line as a double track 100mph multi-functional railway capable of accommodating three passenger services each way per hour.
• Upgrading the existing Aylesbury to Claydon Junction freight single-line to be capable of accommodating one passenger service per hour.
• Retention of existing freight capacity and identification of opportunities to enhance capability.
• Minor upgrading of the existing Bletchley to Bedford passenger railway to accommodate one additional fast passenger service each way per hour
• New station at Winslow
• New high-level platforms and track remodelling at Bletchley
• New overline structures to be constructed to W12 + electrification loading
gauge