The FasTrack repairs began Monday, with the closures affecting the 1, 2 and 3 trains from 10 p.m. to 5 a.m.
The MTA says the No. 2 train will be suspended in both directions from 34th Street in Manhattan to Atlantic Avenue in Brooklyn.
The No. 1 will not operate between 34th Street and South Ferry.
The No. 3 train will be shut down entirely. Free shuttle buses will operate to and from the 148th, 145th and 135th street stations.
The No. 4 train will run local in Brooklyn and extend to New Lots Avenue.
Next on the list for the FasTrack program is the Sixth Avenue line, with parts of the B, D, F and M lines from 59th Street to 4th Street under repair in late February.
The A, C and E lines will have overnight work in mid-March from 59th Street to Jay Street.
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