A subway train derailed near a station in Harlem on Tuesday, frightening passengers, causing minor injuries to seven people and leading to massive systemwide delays.
Authorities said the southbound train struck a tunnel wall just before 10 a.m., causing two cars to derail near the 125th-street station in Harlem.
The MTA added that three disabled trains had been evacuated and passengers were taken safely above ground.
After the emergency break was triggered, cars on a Brooklyn-bound A train dislodged from the tracks and hit a wall near the 125th St. station around 9:45am, said MTA officials. The Fire Department of NY said 34 people suffered non-life-threatening injuries.
Sparks from the skidding train briefly ignited garbage on the track, but there was no serious fire, said Mr Lhota.
He said there was white smoke, and "there was a lot of banging around in that auto - it was really bad".
New York City's B and C trains and portions of the A and D trains have been suspended after a train incident on the A line in Upper Manhattan.
It opened in 2009, replacing an outmoded station that had room for only the first half of a 10-car subway train.
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"This does not look like a failure on the part of equipment", Lhota said.
Emergency personnel have responded to a Manhattan subway station where passengers were reporting smoke and a loss of power. It said there was smoke, but no fire.
"People didn't panic", he said.
"It is my expectation that with new leadership brought by Joe Lhota, the MTA will address the fundamental issues plaguing the transit system and overhaul the organizational structure of the MTA", the Democratic governor said.
The number of subway delays has tripled in the past five years, to 70,000 per month.
It also comes less than two weeks before the start of Amtrak's summer-long work to fix aging infrastructure at New York Penn Station, a project that is expected to increase subway volume as commuters seek alternatives.