The railway line from Cambridge to Newmarket turns out across Coldham's Common and right through the middle of Cherry Hinton, and then carries on passing to the north of Fulbourn.
There are currently (2013) two main routes from the east of Cambridge to Cherry Hinton - the Tins and Snakey Path. However both have long very narrow sections involving pedestrian conflict.
The railway line is single track - but satellite images show the bridges crossing Barnwell Road and Coldham's Lane were both built for dual track. So this means there should easily be enough room to accommodate a cycleway alongside the railway.
This route could then connect up with the Chisholm Trail and provide a direct fast cycle route to and from the city and the Science Park area.