NYPD investigators arrested 41-year-old Jamar Newton of Brooklyn.
He has been charged with Assault and Reckless Endangerment.
Surveillance reveals the attack, which passed off early Saturday evening on the northbound N and R practice platform at Union Square Station.
Police say the 44-year-old sufferer was struck in the again of the pinnacle after an argument, inflicting him to fall onto the tracks.
He was hospitalized in secure situation.
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