London’s newest railway line may not be poetic—its stations include the less-than-lyrical Woolwich—but it is epic. Building it was what is known in engineering as a “megaproject”, and the epithet is deserved
London’s newest railway line may not be poetic—its other stations include the less-than-lyrical Woolwich—but it is epic. Building it was what is known in engineering as a “megaproject”, and the epithet is deserved. It has 42km of new rail tunnels and 13.5km of foot tunnels.3m cubic metres of concrete and the frequent deployment of the internationally understood unit of immensity, the Olympic swimming pool. It is big.
The line nearly didn’t happen. Just as London’s trains and Tubes suffer from congestion, so too do the engineering projects that create them. In the 1980s it was clear London needed more east-west rail capacity but it wasn’t clear how to make it happen. Cross-rail found itself in a queue with other projects, including a new train line from Chelsea to Hackney, in the east of the city. Hackney saved it. When the latter was suggested by civil servants to Margaret Thatcher, she was appalled.
And the new line had complicated things in it. Betjeman may have sneered at air-conditioning but the Elizabeth line has it throughout. To ensure it worked, engineers had to consider big things, such as airflow in the tunnels , and small ones, such as the people on them . Without air-conditioning, says Phil Clayton, its chief engineer, things “become very hot”.
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