Rapid transitRapid transit or mass rapid transit (MRT), also known as heavy rail or metro, is a type of high-capacity public transport that is generally built in urban areas. A rapid transit system that primarily or traditionally runs below the surface may be called a subway, tube, or underground. Unlike buses or trams, rapid transit systems are railways, usually electric, that operate on an exclusive right-of-way, which cannot be accessed by pedestrians or other vehicles. They are often grade-separated in tunnels or on elevated railways.
Washington metropolitan areaThe Washington metropolitan area, also sometimes referred to as the National Capital Region or colloquially as the DMV (named after District of Columbia, Maryland, and Virginia), is the metropolitan area containing Washington, D.C., the federal capital of the United States. The metropolitan area includes all of Washington, D.C. and parts of Maryland, Virginia, and West Virginia. It is part of the larger Washington–Baltimore combined statistical area. The Washington metropolitan area is one of the most educated and affluent metropolitan areas in the U.
Potomac RiverThe Potomac River (pəˈtoʊmək) is a major river in the Mid-Atlantic region of the United States that flows from the Potomac Highlands in West Virginia to the Chesapeake Bay in Maryland. It is long, with a drainage area of 14,700 square miles (38,000 km2), and is the fourth-largest river along the East Coast of the United States and the 21st-largest in the United States. Over 5 million people live within its watershed. The river forms part of the borders between Maryland and Washington, D.C.
MarylandMaryland (USˈmɛrᵻlənd ) is a state in the Mid-Atlantic region of the United States. It borders Virginia, West Virginia, and Washington, D.C., to its south and west; Pennsylvania to its north; and Delaware and the Atlantic Ocean to its east. With a total land area of , Maryland is the eighth-smallest state by land area, but its population of 6,177,224 ranks it the 18th-most populous state and the fifth-most densely populated. Baltimore is the largest city in the state, and the capital is Annapolis.
