The serial subway saboteur accused of creating mayhem on the trains is believed to be the brute behind a violent attack in Brooklyn on Wednesday, a high ranking police source told The Post Thursday.

Cops believe Isaiah Thompson, who’s best known for creating more than 700 subway delays this year by pulling the emergency brake, is the man who randomly shoved a woman headfirst into a train at the Dekalb Avenue B/Q station in Fort Greene, the high ranking source said.

Shocking video of the incident shows a man, believed to be Thompson, jumping up and down and screaming “What!” around 7:20 p.m.

The clip then shows the man appear to shove someone else before turning his rage onto a random female commuter who was standing near him.

Video shows the man push the unsuspecting woman with both hands, forcing her to collide face-first into the waiting train.

Cops are looking to speak with Thompson about the incident.

The alleged saboteur previously told police he likes to “create mayhem” on the trains — mostly in the form of subway-surfing and turnstile-jumping — but his alleged involvement in Wednesday’s attack isn’t his first violent altercation on the subway.

Last November, Thompson allegedly grabbed a woman on the platform of the Halsey Street J train station, put his hands on her and tried to “throw” her — a move eerily similar to Wednesday’s attack, police said.

Three months earlier, in August 2018, he got into a fight with a man and allegedly slashed him in the bicep area with a knife on the stairs leading to the mezzanine at Jay Street-MetroTech, cops said previously.

Thompson, 23, has at least 18 transit-related arrests and was indicted back in May after he was arrested for first-degree criminal tampering, reckless endangerment and public lewdness.

In that case, he was caught exposing his penis to a straphanger and is accused of pulling the emergency brake on a northbound 2 train near 14th Street in Manhattan.

He was soon sprung out of the Manhattan tombs after his mom posted his bail and has been free to create subway havoc ever since — most recently in August when he was busted for subway surfing once again.

In that case, Thompson was charged with reckless endangerment and criminal trespass. Prosecutors asked that bail be set at $2,000 for that case but the judge ended up releasing him without bail, the Manhattan District Attorney’s office said.

The charges he’s facing for surfing are not severe enough for a judge to set bail under new bail reform guidelines set to take effect on Jan. 1.

Many judges have already started to implement the reforms ahead of its implementation.

Thompson has at least six pending criminal cases in Brooklyn and Manhattan.

Additional reporting by Rebecca Rosenberg