On May 17, 2016, a fire started under the Park Avenue Viaduct at 118th Street when a plant nursery that had been leasing space under the viaduct from the city spilled fuel on a hot generator. Temporary repairs allowed for the resumption of service. In July, the MTA Board approved the allocation of $3.3 million to pay for the construction of temporary supports for the structure, which would eliminate speed restrictions imposed for diesel locomotives. That same month, the MTA moved to sue the city over the fire. The temporary repairs were completed in September, and permanent repairs were completed in November. The permanent repairs, which replaced a support column, cost $6 million. After the fire, Metro-North assessed the condition of the entire viaduct and identified sections that critically needed to be replaced. In May 2019, Metro-North announced, as part of its Way Ahead plan to improve service, that it would request funding to replace the Park Avenue Viaduct and repair the Park Avenue Tunnel as part of the MTA's upcoming 2020–2024 Capital Program.