September 10, 2020 | 8:57am

An MTA cleaner was killed Thursday morning when he fell at a Bronx train yard — and possibly touched the third rail, police said.

The 40-year-old worker was at the MTA 239th Street Yard and Maintenance Shop, at East 239th Street and Furman Avenue in Wakefield, when he appeared to have slipped from a train and onto the tracks just after 5 a.m., cops said.

EMS responded and pronounced the employee dead on scene. He was not immediately identified.

The city medical examiner will officially determine his cause of death.

“We are devastated to learn early this morning of the death of a car cleaner at the 239th Street maintenance yard,” MTA Interim President Sarah Feinberg said in a statement. “A full investigation is underway to determine the cause. Our hearts go out to the cleaner’s family and co-workers at this tragic time.”