to relocate and maintain subway entrances that were formerly on the street. The New York City Department of City Planning prepared zoning guidelines for the Union Square area, which would allow a greater maximum floor area ratio in exchange for subway improvements, particularly benefiting the Zeckendorf project. On August 28, 1991, an accident just north of the IRT station killed five riders and injured 215 others in one of the deadliest accidents in New York City Subway history. The operator of a southbound 4 train was to be shifted to the local track due to repair work on the express one. He was running at in a zone and took the switch so fast that only the first car made it through the crossover, and the rest of the train was derailed. Five cars were damaged heavily, being scrapped on site, and the track infrastructure suffered heavy structural damage as a result. The entire infrastructure, including signals, switches, track, roadbed, cabling, and 23 support columns needed to be replaced. The derailment occurred at the entry to a former pocket track on the Lexington Avenue Line station, which was removed when the damage from the 1991 wreck was repaired. In the 1990s, the station underwent a major renovation. On July 9, 1993, the contract for the project's design was awarded for $2,993,948. As part of the contract, the consultant investigated whether it was feasible to reconfigure the IRT passageway, to reframe the exit structure on the Lexington Avenue platforms to accommodate the relocation and widening of stairs, the construction of a new fan room, the removal of stairs on the Broadway Line platforms, the reframing of the existing structure, and the construction of a new staircase between the intermediate and IRT mezzanines. These were all deemed feasible, and in May 1994, a supplemental agreement worth $984,998 was reached to allow the consultant to prepare the design for this work. Plans were prepared by Lee Harris Pomeroy. The project was to cost $38.5 million and start in December 1994, with a new entrance pavilion on the southeast corner of Union Square Park, containing an elevator entrance. The same year, a New York City Transit Police station opened in the Broadway Line mezzanine. A construction contract was ultimately signed in March 1995. The work involved creating a pocket park in a traffic island at the southeast corner of Union Square, a project that