The 6 train is a subway line in the New York City transit system, specifically part of the IRT Lexington Avenue Line. It runs from Pelham Bay Park in the Bronx to Brooklyn Bridge-City Hall in Manhattan, making it a vital transportation option for many commuters. The train is known for its green color on subway maps. The 6 train operates local service, stopping at every station along its route. Key stops include Grand Central-42nd Street, a major hub for connections, and Union Square, a popular area for shopping and dining. The line is essential for accessing various neighborhoods and attractions in the city.