The person was struck about 10 a.m. in the 110th Street Station, the MTA said.
The rupture sent water surging into the 23rd Street subway station.
The 5 and 7 trains are among 17 subway lines affected this weekend.
The victim was struck by a Bronx-bound 2 train about 10 a.m. Tuesday, a fire spokesman said.
A woman hit by an L train in Williamsburg Monday was expected to recover.
The incident, which disrupted the F and A lines, caused rush hour delays at the LES station.
The victim tried leaping onto the platform at the Hamilton Heights station early Wednesday.
The person was not hit by a train, but service along the B and C lines was disrupted, officials said.
A man sustained serious injuries after falling onto the Whitehall Station tracks.
The unidentified victim was taken to Brookdale Hospital with serious injuries, according to the FDNY.
The MTA has extended the R train to Whitehall Street station for the first time since Hurricane Sandy.
Riders will have to eat the cost for the three days of rides they lost to the storm, the MTA said.
Many subway lines are still partly or fully suspended after Hurricane Sandy.
Subway service is gradually resuming in Lower Manhattan.
The MTA is also close to restoring service on the 4/5 and F lines in Lower Manhattan.
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