Construction contracts for the Nassau Street main line in Manhattan were awarded in early 1907, despite no determination of the operator once completed. The line was assigned to a proposed Tri-borough system in early 1908 and to the Brooklyn Rapid Transit Company in the Dual Contracts, adopted on March 4, 1913. Construction of this underground station began in August 1907 and was almost completed by the end of 1910. However, the BMT Nassau Street Line to the south did not open until August 4, 1913 when Chambers Street was ready for service, and the Centre Street Loop was opened. This station was originally configured like a typical express station with two island platforms and four tracks; express service ran on the inner tracks and local service on the outer tracks. When it was built, the station was an important connection point for elevated and streetcar lines. With those lines long gone, a four-track station was no longer considered necessary. As part of the Metropolitan Transportation Authority's 2000–2004 Capital Program, the reconfiguration of the Nassau Street Line between Canal Street and Essex Street took place. As part of the plan, northbound trains were rerouted via the second track from the west, and the former northbound platforms at Canal Street and Bowery were closed. The second track from the east was removed. Work on the project started in 2001. This change took effect on September 20, 2004. The reconfiguration provided additional operational flexibility by providing a third through track, which was equipped with reverse signaling. The consolidation of the Bowery and Canal Street stations was intended to enhance customer security while consolidating passengers onto what used to be the southbound platforms. The project was completed in May 2005, seven months behind its scheduled completion. The project cost $36 million.
Station layout
The station has three tracks and two island platforms. The fourth track, the former northbound express on the abandoned side, was removed in the aforementioned 2004 renovations. Mosaics include the name tablet, "B," "newsstand," "Women," and "Men" in raised letters. A unique feature of the station is the arched wall niches at the north end, rather than the standard rectangular niches. The station featured a news-stand and restrooms, all of which have long been closed. The station has two mezzanine areas on each side of Bowery. Only the eastern mezzanine is open today; the western mezzanine has long been closed, and stairways to it are blocked. The eastern mezzanine is reached via three flights of stairs or a single escalator from the open platform.
Provisions
The east end of the station has a high ceiling; this was to allow for a proposed subway to pass through it. This section had an opening in the wall separating both platforms to bracket the subway, but has been covered with plywood. At the curve between Bowery and Canal Street, there is a small provision for a line into Spring Street, for which no definite plan was ever provided. Due to the depth, there were escalators that were provided in the original construction, one on each platform running to the east mezzanine. The escalator on the south platform was either not installed or removed long ago.
Exits
Two exits go from the east mezzanine to either eastern corner of Delancey Street and Bowery. These are the only open entrances to the station. The original exit from the east mezzanine led to the median of Delancey Street just east of Bowery; it has since been demolished and sealed. In addition to the open exits, there are two exits from the closed west mezzanine that go to either western corner of Kenmare Street and Bowery from inside buildings. The exit to the northwestern corner was completely destroyed, while the exit to the southwestern corner was partly repurposed; part of the southwestern exit remains under MTA property as an emergency exit.
