The first lines of Riyadh’s six-line, 176-km metro network are due to commence operation in the final quarter of 2021. As the world’s largest single-phase metro project nears its conclusion, Rohan and Vamplew address the challenges of delivering such a vast scale of work in a country with no past experience in metro construction, and in Saudi Arabia’s tough environmental conditions.

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(Introductory music: “Tired Traveller on the Way to Home” by Andrew Codeman – CC BY 3.0)