In January 2017, the MTA revealed plans to rehabilitate the tunnel structure above the BMT Fourth Avenue Line's express tracks between 36th Street and 59th Street. As a result, from July 30, 2018 to July 29, 2019, N trains ran local along that section at all times. Between October 21, 2019 and May 4, 2020, N trains terminated at 86th Street so work could be completed to protect Coney Island Yard from flooding. An out-of-system transfer was available between the N at 86th Street and the F at Avenue X station. Afterward, between May and September 2020, the N made local stops on Fourth Avenue on weekends to provide a transfer to the F at Fourth Avenue–Ninth Street, since the F was suspended south of Church Avenue due to construction on the IND Culver Line.