The change is to meet ridership demand, which is at an all-time high, according to the MTA.
Riders complained that the 7 train was delayed Tuesday morning.
Authorities believe the man jumped in front of the train at Grand Central station Monday afternoon.
Joshua Garcia said the "power of the Lord" led him to save Stephanie Xue from Union Square subway track.
The 2, 3, 4, 5, 6, A, C, E, F, G, J, M, N, Q, R and S lines will be affected this weekend.
A man was buying a MetroCard when a thief hit him with a hammer and demanded his money, police said.
The F had more than 300 delay alerts in 2013, more than any other line, a transit advocacy group said.
Upgrades and maintenance is scheduled across 15 subway lines late Friday until early Monday.
A train with mechanical problems on the Manhattan Bridge disrupted subway service, the MTA said.
A person was hit by a 5 train during the Monday evening rush, authorities said.
The MTA is stepping in to fix the Dyckman Street A train station after the landlord failed to do so.
Deion Fludd, 17, was paralyzed and later died after an arrest for fare-beating.
A girl was groped on the subway until she fled at 161st Street-Yankee Stadium, police said.
Commuters jumped onto their seats to avoid a large rodent scampering around the Brooklyn-bound train.
A 21-year-old woman bit her attacker's hand when he tried to rape her in the subway, police said.
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