In message , at 14:43:04 on Wed,
27 Apr 2011, Theo Markettos
remarked:
Actually, the proposal was for "railcars", terminating just west of the
Milton Road in Cambridge. The proposers then expected Network Rail's
tooth fairy to reopen and electrify the line across the Milton Road
(level crossing) and onwards towards Cambridge station, with passengers
changing trains to start with.

Roland, please stop spreading FUD. The costings included an electrified spur
from Chesterton Junction as far as the east side of Milton Road.

http://www.castiron.org.uk/VisionDoc.php
http://www.castiron.org.uk/Stage1Bdetail.php

(perhaps it's slightly ambiguous from the document, but it was definitely
stated at the time)

It doesn't seem ambiguous to me (all Network Rail stuff):

"CAST.IRON trains will terminate at the west side of Milton
Road. Here two new platforms will be constructed, one for
CAST.IRON trains and one for Network Rail trains.

4.2. Network Rail Trackway

"A new 70mph track will be laid from Chesterton Junction to
Milton Road station, running parallel to the CAST.IRON access
track.

"This new Network Rail track spur will cross Milton Road to
reach the new station.... [and] will be overhead electrified.
--
Roland Perry