The Borough Hall/Court Street station is an underground New York City Subway station complex shared by the BMT Fourth Avenue Line, the IRT Broadway–Seventh Avenue Line and the IRT Eastern Parkway Line. The complex comprises three stations: Borough Hall on the IRT lines and Court Street on the BMT line. Located at the intersection of Court, Joralemon and Montague Streets at the border of Downtown Brooklyn and Brooklyn Heights, it is served by the 2, 4 and R trains at all times; the 3 train all times except late nights; the 5 train on weekdays the N train during late nights; and limited rush hour W trains. The Borough Hall station of the Eastern Parkway Line was built for the Interborough Rapid Transit Company (IRT) as part of the city's first subway line. The station opened on January 9, 1908, as part of an extension of the original IRT into Brooklyn. The Borough Hall station of the Broadway–Seventh Avenue Line opened on April 15, 1919, as part of the Dual Contracts. The Court Street station of the Fourth Avenue Line was built for the Brooklyn Rapid Transit Company (later the Brooklyn–Manhattan Transit Corporation, or BMT) as part of the Dual Contracts, and opened on August 1, 1920. Several modifications have been made to both stations over the years, and they were connected within a single fare control area in 1948. The Eastern Parkway Line station under Joralemon Street has two side platforms and two tracks on the same level. The Broadway–Seventh Avenue Line station under Brooklyn Borough Hall also has two side platforms and two tracks, but with the platforms on different levels. The Fourth Avenue Line station has one island platform and two tracks. Part of the complex is compliant with the Americans with Disabilities Act of 1990. The original portion of the interior of the Eastern Parkway Line's Borough Hall station is a New York City designated landmark and listed on the National Register of Historic Places. History First subway Planning for a subway line in New York City dates to 1864. However, development of what would become the city's first subway line did not start until 1894, when the New York State Legislature authorized the Rapid Transit Act. The subway plans were drawn up by a team of engineers led by William Barclay Parsons, chief engineer of the Rapid Transit Commission. The Rapid Transit Construction Company, organized