United States Capitol subway system, Subway system in Washington, D.C.
The United States Capitol subway system is an underground people mover that connects the main Capitol building with various legislative office buildings across the surrounding complex. The network consists of small rail cars running through tunnels beneath the street level, allowing users to travel quickly between these government structures.
The first segment opened in 1909 to quickly transport senators and representatives between the Capitol and nearby buildings. The system expanded over the decades to meet the growing needs of legislative office structures.
The subway is often featured in news segments and political films.
The system is only open to members of Congress and their staff, remaining closed to the public. Visitors can explore the Capitol grounds and surrounding buildings through walking paths and public entrances instead.
The network features small automated cars that operate without drivers, moving through underground corridors independently. This driverless technology was remarkable for when it was built and continues to function today.
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