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,

An MTA trackworker died while working on a Brooklyn L train Wednesday morning, the Transit Workers Union Local 100 reported.

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.