When will London's colossal underground Crossrail project finally be completed?
It's Europe's biggest infrastructure project, with 130 million working hours spent on it so far. As an engineering feat, it rivals the Channel Tunnel, which connects the UK to France. And it has the power to transform travel across one of Europe's busiest and most crowded ci...Tags: london crossrail
cover tunnel photo by: Matt Brown from London, England / CC BY
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