entire fleet has been unitized into five-car sets. As part of the 2020–2024 Capital Plan, the shop will be rebuilt with more space in between track and the replacement of pits with elevated tracks. Corona Yard Corona Yard serves as the home yard of the IRT Flushing Line (). It is located south of Mets–Willets Point, at Flushing Meadows–Corona Park near Citi Field, the National Tennis Center, and the site of the 1939 and 1964 World's Fairs. Corona Yard opened in 1928 and maintains the R188s used on the . It is adjacent to the Casey Stengel Bus Depot. Because the Flushing Line is isolated from the rest of the A Division and its only track connection to the rest of the system is via the B Division, cars that need to undergo or are returning from heavy maintenance are escorted on and off the line by suitably-equipped lead cars via the sole connection to the rest of the system just east (railroad north) of the upper level Queensboro Plaza station. On August 16, 2006, the original 1928 shop building was demolished and replaced by a new, modern shop. With more track mileage to cover and tighter spacing between trains as part of CBTC implementation on the Flushing Line, the MTA announced plans to expand the yard with a second loop and six layup tracks, which would be located on the former right of way of the Long Island Rail Road's Whitestone Branch. Plans for this expansion are on an indefinite hold, however. East 180th Street Yard The East 180th Street Yard is situated at 1145 East 180th Street in the West Farms neighborhood of the Bronx, just east of the Bronx Zoo. The yard consists of eight storage tracks and an adjacent 12-track shop building with a connection to the nearby 19-track Unionport Yard, which lies to the northeast of East 180th Street Yard. The yard is the home of the R142s for the . There is considerable fleet interchange with the . All new car engineering's acceptance testing for newly delivered IRT type cars are performed from here. A new shop building replacing the original 1918 vintage shop building opened in 1999, just in time for acceptance testing of new R142s, which Bombardier started delivering to this facility on November 16, 1999. On October 11, 1923, additional tracks in the yard went into service. Jerome Yard The Jerome