Delays are up nearly 20 percent this year over last, even with modest improvements since March.
The lines have seen the biggest increase in wait times for passengers.
The 1, 2, 4, 6, A, C, D, E, F, M, N, Q, and R lines will be affected by service changes starting Friday.
Service will be disrupted on the 1, 2, 3, 4, 5, 6, 7, A, C, D, E, F, J, M, N, Q, R, and S lines.
Lines 1, 2, 3, 4, 5, 6, 7, A, C, E, F, N, Q and R will be disrupted over the weekend.
The 2, 4, 5, 6, 7, A, C, D, E, F, G, N and R will all be impacted by MTA work.
A broken rail caused major delays Thursday at about 5 p.m.
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