The U.S. Capitol Building Has Its Own Subway System

Beneath the U.S. Capitol complex runs a small, dedicated subway system known as the Capitol Subway System. It consists of two underground rail lines connecting the Capitol building to the House and Senate office buildings, allowing lawmakers and their staff to travel quickly between offices without going outside. The system has been in operation since 1909.

Source

https://www.aoc.gov/explore-capitol-campus/buildings-grounds/capitol-subway-system

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Published: April 8, 2026
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