Trees and branches that tumble onto the subway tracks have already delayed nearly 800 trains this year, MTA data shows — far more than in all of 2023.

The impact has been felt most sharply along the Brighton Line, the stretch of open-air tracks south of Prospect Park where B and Q trains run beneath tree-covered Brooklyn backyards. According to MTA statistics, 415 trains on the Brighton Line were delayed through July 18 because of fallen trees and branches, with that total easily exceeding any of the totals for the previous three full years. Put another way, the line has had 139% more tree-related delays in the first seven months of 2024 than it did in the previous 12 months.

While the 766 systemwide delays tied to trees so far this year reflect just a sliver of the more than 169,000 subway delays overall, riders and homeowners who live next to the open-trench tracks said their recent frequency reflects how vulnerable outdoor portions of the transit system are to tree-rattling wind and storms.