City Hall (BMT Broadway Line)

City Hall is a local station on the BMT Broadway Line of the New York City Subway in Tribeca and Civic Center, Manhattan. It is served by the R train at all times except late nights, when the N train takes over service. The W train also serves this station on weekdays.Station layoutUpper levelThere are two tracks and a very wide island platform. The northbound track is located under City Hall Park, while the southbound track is under the east side of Broadway.There is an active tower at the north end, with a window that lets any waiting passengers observe Transit Authority goings-on. The platform tapers off toward the southern end, where the northbound and southbound portions join. The station's configuration, and the wide-open staircases to the sky above, is responsible for another distinguishing feature: the number of birds that fly into and around the station.This station was overhauled in the late 1970s, changing the station's structure and overall appearance. It replaced the original wall tiles, old signs, and incandescent lighting with more modern wall tiles, signs and fluorescent lights, as well as fixing staircases and platform edges.Before the new City Hall master tower was built, there was a provision at the north end of the upper level for a diamond crossover (which has existed since the construction of this station, when the upper level platform was to be a terminal) which is now occupied by a relay room. At the south end of the station, the uptown track curves away from the wall; this dates from the original construction when the upper level was converted from a terminal, with presumably a straight line, to a through station with a single two-track tunnel.