The 6 Lexington Avenue Local and <6> Pelham Bay Park Express are two rapid transit services in the A Division of the New York City Subway. Their route emblems, or "bullets", are colored since they use the IRT Lexington Avenue Line in Manhattan. Local service is denoted by a (6) in a circular bullet, and express service is denoted by a <6> in a diamond-shaped bullet. 6 trains operate local at all times between Pelham Bay Park in the Bronx and Brooklyn Bridge–City Hall in Lower Manhattan. During weekdays in the peak direction, <6> Pelham Express trains replace 6 local ones north of Parkchester, and run express between that station and Third Avenue–138th Street. During this time, 6 Pelham Local trains short turn at Parkchester (except for peak-direction <6> Express trains that return in the opposite direction as 6 Local trains). Weekdays from 9:00 to 11:00 a.m., select Manhattan-bound <6> trains run local from Parkchester to Hunts Point Avenue while select Parkchester-bound 6 trains run express in that section. The 6 in its current format has run since the implementation of the IRT "H" system in 1918. Since 1920, it has remained largely unchanged, running between Pelham Bay Park and City Hall with a peak-express variant in the Bronx. In 1945, the city closed the City Hall Loop station, the 6 former southern terminal in Manhattan. Since then, most 6 trains have terminated at Brooklyn Bridge, with a few exceptions in later years. History Under the Interborough Rapid Transit On October 27, 1904, local and express service opened on the original subway in Manhattan, following the route of the present IRT Lexington Avenue Line from City Hall to Grand Central–42nd Street. From there, the service traveled west on 42nd Street on the route of the present 42nd Street Shuttle, and then north on the present IRT Broadway–Seventh Avenue Line to 145th Street. The current "H" configuration, with separate services along Lexington Avenue and Broadway/Seventh Avenue, was introduced in 1917. Full Lexington Avenue local service from City Hall to 125th Street opened on July 17, 1918. Local service was extended to Third Avenue–138th Street on August 1, 1918. On January 7, 1919, trains were extended from 138th Street to Hunts Point Avenue, and to East 177th Street on May 30, 1920. Service between Hunts Point Avenue and East 177th Street was originally served by a shuttle service operating with elevated cars.