The Metropolitan Transportation Authority is bringing its "Fastrack" maintenance program to the 1 line in Upper Manhattan this week.
Starting Monday night and for the following three nights, there will be no 1 service between 96th Street and Dyckman Street.
Number 1 trains will run between 242nd Street and Dyckman Street, with Southbound trains will skip 207th Street.
They will also run between South Ferry and 96th Street, then on the 3 line between 96th and 148th Street.
Number 1 trains will skip 145th Street in both directions.
The work starts at 10 p.m. each night and is expected to wrap up Friday at 5 a.m.
For more information, visit mta.info.