A private company called Heathrow Southern Railway has estimated the capital cost of a line from the south to be between £1.3 billion and £1.6 billion. The proposed route would run from the station under Terminal 5 – where two spare platforms are available – to make a connection with the Windsor-Staines Line via a short spur. The main route would continue underground along the M25 corridor as far as a second junction with the existing railway near Chertsey.
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