NYC- A maniacal ex-con randomly carved up a 64-year-old man with two power saws in a Manhattan subway station early yesterday – moments after stealing the tools from a construction crew, police and witnesses said.

“He stabbed me in the heart! Help me!” postal worker Michael Steinberg [pictured] screamed as his 6-foot-tall attacker stood over him, madly revving the black-and-yellow cordless saws.

“I’m dying! He killed me!” Steinberg gasped before the silent, blood-splattered psycho stole $200 and several credit cards from his pockets and fled from the 110th St. station, witnesses told the Daily News.

In the intensive care unit at St. Luke’s Hospital several hours after the ghastly 3:22 a.m. attack, Steinberg said, “I was sure, I was positive, I was a dead man.”

Steinberg said no one in the subway station attempted to help him. “That’s what upsets me more than anything else,” he told The News.

Cops arrested accused madman Tareyton Williams at 5:40 a.m. after he allegedly slugged Oliver Vaquer, 29, who was walking his dog with his pregnant wife on W. 86th St. near West End Ave.

“He was big, all muscles, and he had a crazy blank look in his eyes, but I just thought he was going to ask for money,” said Vaquer, a commercial voice-over artist.

“The next thing I knew he punched me as hard as he could, and I fell on a newspaper box.”

As Vaquer’s wife screamed for help, he said, Williams hit him in the face again and on the arm, then walked away.

“It was the craziest thing,” Vaquer said. “Not a word from him, nothing. He was either on drugs or didn’t take the ones he should have, but we realize now how much worse it could have been.”

The suspect, a 33-year-old convicted drug dealer, was cradling a stuffed toy gorilla shortly after 3 a.m. when he entered the 110th St. station in Morningside Heights, witnesses said.

Construction workers from Five Star Electric Corp. were replacing a sound system when Williams allegedly strolled onto the southbound No. 1 train platform, where he dropped the 2-foot-tall toy.

After urinating into an empty bottle and tossing it into a garbage can, Williams suddenly ran toward the workers, witnesses said.

“He picked up our tools and started chasing us. He just had a dumb look on his face. He seemed deranged,” said one worker. “He didn’t say a word. Nobody knew how to react. Everyone ran in the opposite direction.”

Williams allegedly slammed one of the saws against a random passenger on the platform, but didn’t cut him.

Then Steinberg, who was on his way to work at Manhattan’s 14th St. Post Office, came face-to-face with the madman.

Revving the 8-pound, battery-powered saws, Williams allegedly pounced.

“It looked like an X-Men movie,” said Isaac Prescot, 53, who saw the attack and tried to comfort Steinberg before paramedics and cops arrived.

Cops recovered the saws from a trash bin outside the station, along with Steinberg’s wallet. Williams, who had been released from prison last February after serving three years on a drug conviction, was awaiting arraignment last night on attempted murder, robbery and weapons charges. He muttered, “No, no, no,” as he was led off to Central Booking early this morning.

Steinberg – whose lung was punctured – said he was outraged that Williams was able to steal the saws simply by reaching behind a roped-off area on the subway platform. Steinberg vowed to sue the Transit Authority, but TA spokesman Paul Fleuranges defended the contractors.

“It’s an unfortunate incident,” he said. “We hope the customer recovers, but the contractors appear to have taken proper precautions by putting their tools in an area cordoned off from passengers.”