of the existing station to the west of this new control area will no longer be accessible to passengers. To the west of the end of the platform on track 4, a wall decorated by artwork will be installed, blocking the view of the connection between track 4 and the Broadway–Seventh Avenue Line. A new underpass at the eastern end of the new platform was originally planned to be constructed. This underpass was to pass under track 4 and lead to an existing easement passageway in the basement of the Bank of America Tower. A new fare control area was to be constructed at the west end of the passageway, leading to a new entrance on the north side of 42nd Street between Broadway and Sixth Avenue. The passageway was to be used for a free transfer to the IND Sixth Avenue Line's 42nd Street–Bryant Park station, allowing passengers access to the B, D, F, and M trains. The underpass was to be mined below track 4, and trains running on the track would have been supported by micropiles and skeletonized track. In July 2021, the MTA amended the contract to eliminate the passageway under track 4 in favor of a new ramp between tracks 1 and 4, connecting at its eastern end to two staircases to the Sixth Avenue Line. The amendment was made because the Bank of America Tower's owner The Durst Organization did not want to pay for the new underpass, as it had been obliged to do, and because mining the underpass would have disrupted shuttle service. At Grand Central, the center track, track 3, was removed and the two existing platforms were connected, providing one wide island platform, with an area of . This became the largest platform in the subway system. The existing northern platform was extended further west to accommodate six-car trains, using existing employee facility rooms. New consolidated employee facility rooms were constructed on the existing location of the switch connecting tracks 1 and 3. The P-4 staircase at the western end of the station leading to Madison Avenue from the existing northern platform was demolished and the P-3 staircase leading there from the existing southern platform was considerably widened. Track layout Of the four shuttle tracks, only two are in use ; the former express track spaces are used as platform space at each terminal. The former southbound local track is