articleThe Brief The 1, 2 and 3 subway lines will undergo service changes for the next several weekends. These service changes will be in effect until August 24. The 1, 2 and 3 subway lines will undergo service changes for the next several weekends. Starting this weekend, riders should plan their commute around the following service changes:1 trains will not run south of 14th St.2 trains will run between Eastchester—Dyre Ave. and 34th St.—Penn Station. 3 trains will not run – the service between Harlem—148th St. and New Lots Ave. will be suspendedThese service changes will be in effect until August 24.