CTRL Section 2 includes almost 20 km of tunnels underneath London. They provide high-speed access to the refurbished and extended St Pancras station, via new stations at Ebbsfleet and Stratford. The twin bore tunnels include five ventilation shafts and six portals, all with ventilation fan arrangements, over a hundred equipment rooms and many miles of cabling. The contract was awarded to EMCOR Rail in July of this year.
Source
Building Sustainable Design
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