A consultation has opened on East-West rail routes from Bedford to Cambridge.  They all go via Bedford but some not directly to the Town Centre.  Some go south near Sandy  and some further north near Tempsford / South of St. Neots and then via Cambourne.  The challenges are to avoid impacting Wimople Hall estate and the RSPB and whether a train link from Cambourne would duplicate the plans to develop a metro from Cambourne to Cambridge.

https://eastwestrail.co.uk/haveyoursay

The Campaign to Protect Rural England have given some feedback on this which is available here:

CPRE briefing East West Rail