A Brooklyn woman was arrested yesterday after she allegedly pushed an elderly homeless man onto the subway tracks at Union Square.

Police say the incident happened around 5:30 p.m. when suspect Sandra Zelazny, 32, got into an argument with a 70-year-old man at the 6 train platform at Union Square. It's unclear what precipitated that, but Zelazny allegedly pushed him onto the tracks, then boarded a train.

The victim, whose name hasn't been released, suffered an injury to his forehead and was taken to Bellevue Hospital. He was able to identify his assailant to police, who arrested her about an hour later.

Zelazny, a Borough Park resident, has been charged with assault and reckless endangerment.

In 2012, a homeless man allegedly pushed a Queens dad to his death in front of an oncoming train in a highly-publicized incident that was caught on camera by a Post photographer. Suspect Naeem Davis was offered a plea deal today that will save him from spending life in jail for shoving Ki-Suck Han in front of a Q train on Dec. 3, 2012. According to the Post, Davis will be offered a 22-year jail sentence on manslaughter charges. A source added that Han's "family is not opposed to the plea deal."