Baltimore is an independent city and the largest city in the state of Maryland in the United States. Baltimore is located in central Maryland at the head of the tidal portion of the Patapsco River, an arm of the Chesapeake Bay. Baltimore is sometimes referred to as Baltimore City in order to distinguish it from surrounding Baltimore County. Founded in 1729, Baltimore is a major U.S. seaport and is situated closer to major Midwestern markets than any other major seaport on the East Coast. Baltimore's Inner Harbor was once the second leading port of entry for immigrants to the United States and a major manufacturing center. The harbor is now home to the Harborplace, a shopping and entertainment center, and the National Aquarium in Baltimore. After a decline in manufacturing industries, Baltimore shifted to a service sector-oriented economy. Johns Hopkins University and Johns Hopkins Hospital are now the city's largest employers. Despite some economic revitalization efforts, Baltimore still has many urban problems such as concentrated poverty, crime, and inadequate public education.

As of 2015, the population of Baltimore was 661,400. The Baltimore Metropolitan Area, which includes the city's surrounding suburbs, has approximately 2.6 million residents; the 20th largest in the country. Baltimore is also the largest city in the Baltimore-Washington Metropolitan Area of approximately 8.1 million residents.

The city is named after Lord Baltimore in the Irish House of Lords, the founding proprietor of the Maryland Colony. Baltimore himself took his title from a place in Bornacoola parish, County Leitrim and County Longford, Ireland. Baltimore is an anglicized form of the Irish Baile an Tí Mhóir, meaning "Town of the Big House", not to be confused with Baltimore, County Cork.

Metro System of Baltimore

Metro Subway

The Baltimore Metro Subway, known locally as the Metro Subway, The Subway, or Baltimore Metro is a rapid transit line serving the greater Baltimore, Maryland, United States area and operated by the Maryland Transit Administration. Despite its name, less than half of the line is underground; most of the line outside of the central city is elevated or at grade.

The origins of the Metro Subway lie in the Baltimore Area Mass Transportation Plan, published in 1965, which envisioned six rapid transit lines radiating out from a central city loop. Planning studies from 1968 proposed a rail transit system 71 mi (114 km) long.

As the vision was translated into reality, the original concept was trimmed to a 28 mi (45 km) system in the Phase 1 plan, published in 1971. This plan involved two of the original six lines: a northwest line from Downtown Baltimore to Owings Mills and a south line to Glen Burnie and the airport. Phase 1 was approved for funding by the Maryland General Assembly in 1972. In response to crime concerns of Anne Arundel County residents, the MTA eliminated the south line from Phase 1 plans in 1975.

When the Baltimore Metro opened on November 21, 1983, only the "Northwest" line of the 1965 plan had come to fruition. This 12.2 km (7.6 mi) segment provided service between Charles Center in Downtown Baltimore and Reisterstown Plaza in the northwest section of the city. In 1987, a 9.8 kilometres (6.1 mi) addition extended the line from Reisterstown Road Plaza to Owings Mills in Baltimore County, much of it running in the median of I-795. A further extension of 2.5 km (1.6 mi) from Charles Center to Johns Hopkins Hospital was opened in 1994.

Once the project was completed in 1995, the total cost for the Metro Subway was $1.392 billion.

The current system is 24.8 km (15.4 mi) long, including 10 km (6.2 mi) underground, 3.5 km (2.2 mi) elevated, and 11.3 km (7.0 mi) at grade. Eight of its 14 stations are underground, at depths of 16 m (52 ft) to 34 m (112 ft) below street level. Its elevated stations stand from 25 ft (7.6 m) to 28 ft (8.5 m) above ground.

Luciano Mende

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