Opened in 2016 after 17 years of construction, the 57.1-kilometer Gotthard Base Tunnel beneath the Swiss Alps is both the longest and deepest railway tunnel in the world, reaching about 2.3 kilometers below the mountains above it. It cut travel time between northern and southern Switzerland to roughly 20 minutes.
Record no. MRB-2026-005754
Longest and Deepest Railway Tunnel in the World
Reference Record – Not Certified
This record is compiled from publicly available sources for reference. It has not been examined or certified by The Book of World Records.