An MTA worker died after collapsing at a Brooklyn subway station; the union vows to investigate potential hazards.

An MTA track cleaner collapsed on the job in Brooklyn this week, dying a short time later of an apparent heart attack, the Transport Workers Union said. Ricardo Louis, 44, was assigned to a track cleaning gang along the L line in Bushwick early Wednesday morning when he collapsed aboard a work train in the Morgan Ave.

An MTA worker died after going into cardiac arrest on an L train in Brooklyn, sources said. The 44-year-old subway track worker, identified by the Transport Workers Union as Ricardo Louis, collapsed while performing his job duties at the Morgan Avenue stop,

A subway track worker collapsed and died early Wednesday morning while on duty in Brooklyn, the Transport Workers Union announced. The union said Ricardo Louis, 44, collapsed around 3:10 a.m. while working on an L train at the Morgan Avenue station.