A Bronx straphanger who held the emergency gate open for other riders was slashed repeatedly during a Monday morning clash, according to cops and a report.
The 37-year-old man was knifed all over his body when tensions flared with a blade-wielding brute inside the No. 4 train station at West 170th Street and Jerome Avenue in Mount Eden, authorities said.
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The victim was holding the gate open when the violence erupted, AM NY reported…