HS2 'will be the most expensive railway on Earth'    

Britain’s new high-speed rail line will be the most expensive railway in the world with costs per mile expected to reach £403m, according to Government calculations.  The HS2’s first phase between London and Birmingham will cost almost £48bn, according to expert analysis commissioned by the Department for Transport (DfT). 

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Troubled Carillion wins HS2 building contract news.sky.com
The project's major contracts are awarded for firms to build tunnels and viaducts between London and Birmingham.

HS2 reveals winners of building contracts - BBC News www.bbc.co.uk
Contracts worth £6.6bn are awarded ahead of news on the final HS2 routes to Leeds and Manchester.