Service on the 1 line was suspended Chambers Street and 137th Street Wednesday evening.
Maintenance was set to disrupt 1, 2, 4, 5, 7, A, C, E, F, G, J, M, N, Q, and R trains over the weekend.
Police are looking for the suspect who broke into a locked office and took a 25-inch monitor.
Emily Singleton, 22, was found dead on Sunday with a head trauma consistent with a fall, police said.
A woman was pulled to safety after falling onto the tracks of the Hewes St. station Thursday afternoon.
Service was disrupted on the 2 and 3 subway lines after a person was reported in the 125th Street tunnel.
The 1, 2, 3, 4, 5, 6, 7, A, C, E, F, G, J, M, N, Q, R and S lines will be affected, the MTA said.
The MTA will require orange cones and safety harnesses at hazardous areas.
Long Island Rail Road cancellations and delays ran into a second day after derailment, the MTA said.
MTA riders can expect service changes along 13 subway lines.
A man, who appeared to be about 50 years old, was hit by a downtown 1 train, officials said.
4 train service was temporarily disrupted by a fire at 2279 Jerome Ave., officials said.
The weekend disruptions come ahead of the FASTRACK program in Washington Heights/Inwood next week.
A power failure left part of the 7 train line without service during rush hour.
A vehicle slammed head-on into a parked M10 bus in Harlem, officials said.
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