(from north to south:)
LEXINGTON AVENUE – 63RD STREET
(the IND 63rd Street Line and BMT 63rd Street Line, also referred to as the 63rd Street Crosstown or Route 131-A, are two rapid transit lines of the IND and BMT divisions of the ‘New York City Subway’ system)
(the two lines run under 63rd Street on the ‘Upper East Side’ of ‘Manhattan’ and meet at the Lexington Avenue–63rd Street station.
(the IND line is served by F trains at all times; it connects the ‘IND Sixth Avenue Line’ in ‘Manhattan’ to the ‘IND Queens Boulevard Line’ in ‘Queens’)
(the BMT line is served by the Q train at all times, and some N trains during rush hours)
(also known as the ‘Second Avenue Connector’, it links the ‘BMT Broadway Line’ to the ‘IND Second Avenue Line’)
(under the current service plan, no service needs to cross between lines, however this has been used, mainly during service disruptions and once during the ‘Manhattan Bridge’ closures)