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Saudi Arabia will soon have a subway system in the capital, Riyadh, that's said to be the world's biggest current investment in public transport.
It's the latest such development in the Arabian peninsula: Dubai opened the first subway system in the Gulf back in 2009, while Qatar has commissioned a metro to be built in Doha ahead of the 2022 World Cup.
Riyadh's metro will have six lines and cost $22 billion, with driverless trains, state-of-the-art technology and stations designed by some of the world's leading architects.
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