Police say a 31-year-old man defecating between cars on the uptown 6 train was killed when he fell onto the tracks and was struck by the train he was riding.

Witnesses tell police the victim had been defecating between the cars when he fell just after 4 p.m. as the train was leaving the 125th Street station.

In a separate incident minutes earlier across the same platform, police say a 50-year-old homeless man was seen climbing out of the Bronx-bound 5 express track, injured and bleeding.

Police say the man had a broken pelvis and gashes. He told police he's not sure what happened, and was taken to Harlem Hospital.

The circumstances surrounding that incident are unclear. Service on the 4, 5, and 6 trains was restored Tuesday night after earlier delays and disruptions.

"The platform was just packed with people," one rider said. "It didn't look good for anybody down there."