Square West between these two streets, opposite the equestrian statue of George Washington, while the other is closer to Union Square East and 15th Street. These entrances more directly serve the Broadway Line platforms. The Union Square Park entrances contain large polygonal metal-and-glass canopies, which date from a 1985 renovation of the park. At the northern end of the station, two stairs rise to Union Square Park on the east side of Union Square West at 16th Street. These lead most directly to the Broadway Line platforms. IRT Lexington Avenue Line platforms The 14th Street–Union Square station is an express station on the IRT Lexington Avenue Line. The 4 and 6 trains stop here at all times; the 5 train stops here at all times except late nights; and the train stops here during weekdays in the peak direction. The station has four tracks and two island platforms. The uptown and downtown platforms are offset from each other, having been extended at their rear ends, and are slightly curved. Platform gap fillers, on the downtown side, use proximity sensors to detect when trains arrive, automatically extending when a train has stopped in the station. The island platforms allow for cross-platform interchanges between local and express trains heading in the same direction. Local trains use the outer tracks while express trains use the inner tracks. The island platforms were originally long, as at other express stations on the original IRT, but later became long. The platforms are wide at their widest point. The station has two abandoned local side platforms; the northbound platform is visible through windows, bordered with wide, bright red frames. A combination of island and side platforms was also used at Brooklyn Bridge–City Hall on the IRT Lexington Avenue Line and 96th Street on the IRT Broadway–Seventh Avenue Line. These side platforms were built to accommodate extra passenger volume and were built to the five-car length of the original IRT local trains. When trains were lengthened, the side platforms were deemed obsolete, and they were closed and walled off. Design As with other stations built as part of the original IRT, the station was constructed using a cut-and-cover method. The tunnel is covered by a "U"-shaped trough that contains utility pipes and wires. The bottom of this trough contains a foundation of concrete no less than thick. Each platform consists of concrete slabs, beneath which are drainage basins.