Ax wacko: What guy on train?

A man charged with trying to swing an ax at a subway train passenger didn’t entirely understand Thursday why he was under arrest and locked up.

Reinaldo Reyes, 46, said he wasn’t even sure if the person he’s accused of trying to attack is real.

“That person might not even exist,” Reyes mused to a Daily News reporter.

During an oddly polite interview at the Manhattan Detention Compex, Reyes expressed interest in the media coverage of his case — and admitted he was a bit depressed over his arrest.

“I’m feeling a little dejected,” Reyes (below right) said.

A pair of Good Samaritans sprung into action Saturday evening when when Reyes pulled a hatchet out of a bag on a No. 1 train on the Upper West Side and allegedly began to swing it at unsuspecting passenger Anthony Castro.

Mark Pickett and another brave straphanger subdued Reyes before the hatchet made contact. Cops arrested Reyes, a Jersey City resident, at the W. 66th St. station.

Mark Pickett, one of the subway saviors, told The News he saw Reyes board the train at the 50th St. station, and that he had a “crazed look in his eye.”

Reyes is charged with assault, reckless endangerment, 10 counts of weapons possession, menacing, disorderly conduct and unlawful possession of Mace.

The accused hatchetman told The News he has not been physically or mentally evaluated by a doctor. “There’s no treatment,” Reyes said. “Physically, mentally, I’m OK.”