The Paris Metro is famously quiet compared to the London Underground or the NYC Subway primarily due to the use of rubber-tired trains (matériel pneu) on several major lines, such as Lines 1, 4, 6, 11, and 14. In 2026, this technology allows the trains to run on specialized tracks with much higher traction, which eliminates the high-pitched "metal-on-metal" screeching common in traditional subways when navigating curves. Additionally, rubber tires allow for faster acceleration and smoother braking, creating a "hushed" hum rather than a roar. Another factor is the infrastructure; many Paris Metro stations are built with high, vaulted stone ceilings that are plastered, which helps dampen sound rather than echoing it. While the older steel-wheeled lines are still a bit noisy, the 2026 expansion of the "Grand Paris Express" continues to prioritize this rubber-tire technology to make the subterranean journey through the City of Light as peaceful as possible.