Heathrow Southern Railway: The new £1.2 billion train line which could link airport with Guildford and Waterloo

If approved, the eight additional miles of railway will see a new bridge being built above the M3 as it runs parallel along with the M25

from getsurrey - News http://www.getsurrey.co.uk/news/surrey-news/heathrow-southern-railway-new-12-13526219