G Train (Brooklyn-Queens Crosstown)

The G Brooklyn-Queens Crosstown is an 11.4-mile-long (18.3 km) rapid transit service in the B Division of the New York City Subway. Its route emblem, or "bullet," is colored light green since it uses the IND Crosstown Line.

The G operates at all times between Court Square in Long Island City, Queens, and Church Avenue in Kensington, Brooklyn. It is unique in that it is the only non-shuttle service in the system that does not run within the borough of Manhattan. The G serves two stations in Queens—Court Square and 21st Street, both in Long Island City. Before 2010, it served all stations on the IND Queens Boulevard Line between Court Square and 71st Avenue in Forest Hills. In 1939 and 1940, the then-designated GG used the now-demolished IND World's Fair Line to access the 1939 New York World's Fair. The GG, which became the G in 1985, had its southern terminal at Smith–Ninth Streets from 1976 to 2009.

In the 21st century, the G faced a variety of issues, leading to complaints from residents along the route. These included a lack of transfers to other services, no direct service to Manhattan, short train lengths, and low frequencies. Since the 2000s, several improvements have been implemented, including a route extension in Brooklyn and a full-route audit in 2013 that identified solutions to the service's issues. As of 2023, additional improvements are planned for the G route, including the automation of the entire line.