The title is fleeting. Here are the projects that will steal the crown in the next 18 months:
As of , the official "youngest tube" in the world—defined as the most recently opened major underground driverless metro segment—is Line 15 South of the Grand Paris Express (opened December 2024) , with an honorable mention to Line 13 in Shenzhen, China (opened November 2024) . youngest tube
The youngest tubes are always driverless. They use AI to manage headways as low as 85 seconds. The Paris Line 14 (the previous record-holder) operates with such precision that trains arrive every 60 seconds during peak hours. The title is fleeting
In geomorphology, a "tube" refers to a —a natural conduit formed by flowing lava from a volcanic eruption that cools and hardens on the surface while remaining molten and active beneath. When the lava eventually drains out, it leaves behind a hollow, cave-like structure. They use AI to manage headways as low as 85 seconds