An MTA worker died Tuesday after falling at the 125th...

An MTA worker died Tuesday after falling at the 125th Street station in Harlem, police said. Credit: Rajvi Desai

An MTA worked died after falling 20 feet inside a Harlem subway tunnel early Tuesday morning, police said.

The 23-year-old worker, who was not immediately identified, was picking up debris from a southbound 6 train track south of the 125th Street subway station at about 4:50 a.m. when he fell onto the 4/5 train track below, cops said.

He was found unconscious with head trauma and pronounced dead at the scene, police and fire officials said.

New York City Transit president Andy Byford said a full investigation into the worker’s death is underway.

“These are the days you dread,” he said in a statement. “We are appreciative of New Yorkers’ patience during this morning’s rush hour and for the caring they’re showing for our fallen colleague.”

The Transport Workers Union Local 100 called the man’s death a tragedy “for the entire city.”

“While everyone else was asleep, this young man was working in a tunnel beneath Manhattan so others could get to work, or school, or wherever else they need to go to,” Tony Utano, the union’s president, said in a statement. “We will be conducting an investigation to determine exactly happened and will assist the family in every way possible.”

Service changes were in effect on 4, 5 and 6 trains for several hours following the incident. Regular service, with trains bypassing 125th Street, was restored at about 8:45 a.m., the MTA said.

Commuters should expect delays, the agency warned.

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