are drainage basins. The platforms contain I-beam columns spaced every . Additional columns between the tracks, spaced every , support the jack-arched concrete station roofs. The trackside walls also contain exposed I-beam columns, dividing the trackside walls into 5-foot-wide panels. The panels on the trackside walls consist of white square ceramic tiles. A frieze with multicolored geometric patterns runs atop the trackside walls, with a square mosaic tile placed inside the frieze at intervals of three panels. A band of narrow green tiles runs along the left and right edges of each white-tiled panel, as well as below the frieze and mosaic tiles. The mosaic tiles, by Jay Van Everen, are part of a work entitled "The junction of Broadway and Bowery Road, 1828", a reference to the two streets that intersected at Union Square. In 2005, an artwork called City Glow by Chiho Aoshima was installed here. BMT Canarsie Line platform The Union Square station (announced as 14th Street–Union Square on rolling stock) on the BMT Canarsie Line has two tracks and one island platform. The L train stops here at all times. Various stairs and an elevator go up from the platform to the mezzanine. There are also two stairs leading directly to each of the Broadway Line platforms. An escalator leads directly from the Canarsie Line platform to the IRT mezzanine. The tunnel is covered by a "U"-shaped trough that contains utility pipes and wires. The bottom of this trough contains a concrete foundation no less than thick. The platform consists of concrete slabs, beneath which are drainage basins. The platform contains I-beam columns spaced every . The trackside walls also contain exposed I-beam columns, dividing the trackside walls into 5-foot-wide panels. The panels on the trackside walls consist of white square ceramic tiles. A band of narrow green tiles runs along the left, right, and top edges of each white-tiled panel. A frieze with multicolored geometric patterns runs atop the trackside walls, with a hexagonal mosaic tile with the letter "U" placed inside the frieze at intervals of three panels. References Further reading External links nycsubway.org: nycsubway.org – Framing Union Square Artwork by Mary Miss (1998) nycsubway.org – Paradise Artwork by Chiho Aoshima (2005) nycsubway.org – City Glow Artwork by Chiho Aoshima (2005) Google Maps Street View: 14th Street and Broadway entrance to Canarsie Line 14th Street and Fourth Avenue entrance Entrance by Union Square East