The long-defunct 9 train was spotted Thursday, nine years after it was axed by the MTA.
The 1, 2, 4, 5, 6, 7, E, F, G, L, N, Q, R and S lines will be affected by construction this weekend.
Daniel St. Hubert allegedly stabbed a man Wednesday before heading to kill his mother, sources said.
The man was attacked on the downtown platform of the 18th Street station, police said.
Upgrades and maintenance is scheduled across 15 subway lines late Friday until early Monday.
Five of the men who attacked the 29-year-old lawyer were quickly arrested, police said.
There will be no overnight 1 train service between 96th and Dyckman streets from March 24 to 28.
The 1, 4, 5, 6, 7, A, C, D, E, F, G, J, N, Q, R, 42nd St. Shuttle and Rockaway Shuttle will be impacted.
Nearly half of all subway lines were dirtier in 2013 than they were in 2011, according to the survey.
Here's how to get around this weekend amid subway service disruptions
The 1, 2, 3, 4, 5, 6, 7, A, C, D, E, F, G, N, Q, R and S lines will all see disruptions.
A northbound 1 train struck a man in TriBeCa's Franklin Street station, police said.
The 1, 4, 5, 6, 7, A, C, E, F, G, N, Q, R and Franklin Avenue Shuttle will see changes.
Signal problems disrupted the 1, 2 and 3 subway lines in most of Manhattan, the MTA said.
The renovation of the Dyckman Street station replaced the platforms and added a new elevator and ramp.
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