A subway maniac with 87 prior arrests was just busted for two transit stabbings — carrying the “large knife’’ he allegedly used in the violence, police and sources said Sunday.

Jamar Banks — a 52-year-old with a long rap sheet and history of mental illness — was nabbed by the NYPD Warrant Squad around midnight at the 219th Street station in The Bronx and brought to the NYPD’s Transit Bureau District 2 in Manhattan, police sources said.

He was carrying what had been described by police as a “large knife,” which he allegedly used in last week’s attacks, sources said.

​Banks was last busted in November — twice for petty theft — and released with summonses to later appear in court, sources said. 

​He is being held on charges of first-degree assault and third-degree weapons possession​ in last week’s straphanger stabbings, cops said.

​The suspect looked disheveled when he was walked out of the transit district in cuffs Sunday afternoon, with his torn white jeans collapsing down his skinny legs to show his red underwear.

He refused to say a word when asked about the stabbings by The Post, and he seemed dazed and overwhelmed as reporters hurled questions at him. He was eventually taken to the hospital, court officials said, without providing further details.

One woman yelled out, “You’re disgusting!” as the accused was led into a waiting police cruiser.

Alina Goldfine, a 19-year-old student at NYU Stern, was heading to the Midtown campus when she stumbled across the perp walk.

“It’s disgusting​, and he needs to be punished at whatever cost,” Goldfine told The Post, adding that​city subway crime is out of control.

“It’s horrible,” she said. “I’m a student in New York​, and I feel very terrified to even take the subway. It makes it unaffordable for me to travel everywhere.”

Banks is a frequent flier on the No. 2 and No. 5 subway lines, according to a message sent to police officers before his arrest and obtained by The Post. He was nabbed at a station on the lines.

Officers were warned that they should use “extreme caution” approaching the suspected criminal because he might be carrying the attack weapon.

Banks was wanted for allegedly stabbing a 31-year-old man on a No. 2 train at 14th Street and Seventh Avenue in Manhattan on Wednesday after arguing with his victim, cops said.

He is also suspected of starting another argument with an off-duty MTA cleaner about 6 a.m. Thursday, then knifing his victim in the back and armpit on the northbound No. 6 train platform at Pelham Bay station in The Bronx, police said.

The attacker fled after both stabbings. Both victims were taken to hospitals in stable condition. 

Banks’ rap sheet includes arrests for alleged attempted murder, weapons possession, assault, criminal trespassing, turnstile jumping and petty larceny, police sources said.