Discover the fascinating history behind Washington, D.C.’s forgotten Senate subway, a secretive underground rail system connecting the U.S. Capitol to nearby Senate office buildings. Built over a century ago to streamline travel for senators, this hidden subway system reflects a bygone era of innovation, convenience, and exclusivity in the heart of American government. From its early days as an open-air electric trolley to today’s high-tech, underground cars, the Senate subway has remained a little-known part of Capitol Hill’s infrastructure. Join us as we uncover why this unique subway was built, how it’s evolved, and why it’s still used by senators today—though rarely seen by the public.