Power briefly went out in a tube leading to the station, officials said.
1, 2, 3, 4, 5, 6, 7, A, C, D, E, F, L, N, Q and R train lines will be affected by the changes.
Signal problems forced three subway lines to suspend service between Manhattan and Queens Monday.
Plan will reduce by half the number of people at the jail a year or longer awaiting trial.
The waterfront park between 43rd and 51st Streets debuted Wednesday after multiple delays.
A man was hit by an F train in the Fourth Avenue station Monday morning, officials said.
Due to "temporary power loss" systemwide, all subways were briefly running with delays, the MTA said.
The $2.5 million project was delayed after workers discovered gaps in the soil beneath the wall.
The mayor said the results of an ongoing investigation could prompt changes to the 911 system.
Nearly 500 survivors are on the list for housing because they were abused, the agency said.
Problems at Union Square sparked widespread service disruptions on the 4, 5 and 6 trains Monday.
Schools were open and subways running close to normal for Monday's rush-hour commute.
Officials said 4, 5 and 6 trains have resumed service in both directions.
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.
The MTA Subway TIme app will give commuters real-time subway arrival information.
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