A driverless pod system is proposed is proposed to connect CBC and Trumpington P&R.
see:
http://www.cambridgeindependent.co.uk/news/cambridge/innovate-uk-have-put-up-250-000-to-get-two-cambridge-medical-campuses-serviced-by-driverless-buses-1-4993867
It 'implies' it will use maintenance-track!
"An out-of-hours driverless shuttle service on the fixed path from Trumpington Park and Ride will aim to allevieate congestion on the Cambridge Biomedical Campus."

We need to find out more.
A similar system is proposed to connect Whittlesford station and Genome Campus. This should offer possibilites for a new walking and cycling route.