It happened just before 11 a.m. inside the Crown Heights-Utica Avenue Station.
Mryan Pollack, 64, was stabbed in the leg and torso.
Police say Pollack -- an operator for 25 years -- was attacked by a 27-year-old suspect after telling customers to disembark the number 4 subway train at the last stop at the station.
The suspect refused and a dispute spilled onto the platform, where Pollack was stabbed.
Pollack was taken to Kings County Hospital.
The suspect was taken into custody with charges pending.
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