Getting to downtown Washington, D.C. from Reagan National Airport or Union Station is easy if you use the Metro. Our resident D.C. expert guides you step by step between two train stations and offers tips, from the flashing floor lights to the quirky rule of escalator etiquette here. For tourists visiting, here’s how to swipe in and start riding the city’s Metrorail system. Read more: https://wapo.st/2CxFjFl. Subscribe to The Washington Post on YouTube: https://wapo.st/2QOdcqK

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