Madman fatally stabs straphanger, 59, during argument on rush-hour NYC subway train: police

An argument aboard a Queens subway train turned deadly Wednesday when a madman pulled out a sharp object and fatally stabbed a fellow passenger during the evening rush, police and sources said.

The bloodshed erupted around 5:20 p.m. aboard a packed southbound J Train as it approached Woodhaven Boulevard station, according to authorities.

During the heated exchange, the suspect plunged the sharp object into the 59-year-old victim before barging off the train at the Woodhaven stop, law enforcement sources said.

Photos from the scene show what appears to be a serrated kitchen knife and scattered, bloodied clothing on the platform.

Surveillance footage obtained by The Post shows straphangers pouring out...