When urban planners and transit enthusiasts talk about subway systems, the conversation often revolves around the oldest lines—the London Underground’s Metropolitan line (opened 1863), the Budapest Metro, or the Glasgow Subway. However, there is a growing fascination at the opposite end of the spectrum: the "youngest tube."
For the enthusiast, chasing the "youngest tube" is a global scavenger hunt. One month it is deep beneath the Seine in Paris; the next, it is under the skyscrapers of Shenzhen. But one thing is certain: The youngest tube is always the best tube—until tomorrow’s opening ceremony. youngest tube
Line 18, Paris, 2026. Set your calendar. Keywords used: youngest tube, new metro line, fully automated subway, Grand Paris Express, Line 15 South, driverless underground, modern rapid transit. When urban planners and transit enthusiasts talk about
However, transit purists argue that a true "tube" requires a small-diameter bored tunnel (like London’s 3.56m diameter). By that hyper-specific definition, the youngest tube is actually the (Battersea Power Station station, opened September 2021), because the Grand Paris Express tunnels are wider (8.7m) and don't fit the "tube" profile. Conclusion: The Future is Underground The concept of the "youngest tube" is a moving target. It is a title that represents human ambition, engineering pain, and urban salvation. Every time a city finishes one line, two more are drawn on a blueprint. But one thing is certain: The youngest tube
The term "youngest tube" refers to the most recently opened fully automated, high-frequency metro line that operates underground in a major metropolitan area. While the title changes hands every few years as cities like Moscow, Delhi, and Paris inaugurate new segments, one name consistently dominates the conversation as of 2025-2026: