up to the upper level, near the passageway to the northbound IRT Eastern Parkway Line platform. At the western end of both platforms, a staircase from the lower level goes up to the upper level before another staircase goes up to a mezzanine. The lower level also has an up-only escalator that bypasses the upper level, leading directly to the mezzanine. A single elevator stops at all three levels. At the eastern (railroad south) end of the platforms, the southbound track crosses under the tracks of the Eastern Parkway Line, and both tracks become the local tracks for the line. Design Both platforms have their original IRT trim line and name tablets reading "BOROUGH HALL" in a serif lettering style. Tablets showing images of Borough Hall are located at regular intervals on the trim line. Dark blue I-beam columns line both platforms at regular intervals with alternating ones having the standard black station name plate in white lettering. IRT Eastern Parkway Line platforms The Borough Hall station on the IRT Eastern Parkway Line has two tracks and two side platforms. The 4 train stops here at all times, while the 5 train stops here at all times except late nights. The platforms were originally long, as at other Contract 2 stations, but were lengthened to by 1964. Two staircases from each platform lead to each of the two overpasses at the center of the station, while one staircase from each platform leads to the overpass at the extreme west end. In 1979, the New York City Landmarks Preservation Commission designated the space within the boundaries of the original station, excluding expansions made after 1904, as a city landmark. The station was designated along with eleven others on the original IRT. The original interiors were listed on the National Register of Historic Places in 2004. East of this station, the two tracks become the express tracks of the IRT Eastern Parkway Line and the two tracks of the IRT Broadway–Seventh Avenue Line become the local tracks. 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. The platforms contain green I-beam columns,