K2 is hell on rails!

A zombie-like user stunned straphangers at a Brooklyn subway station as he lay zonked out and drooling on the tracks — right next to the electrified third rail, police sources and witnesses said Friday.

The 51-year-old user, whose face appeared to be decomposing, was gumming his lips and muttering incoherently, disturbing video footage showed. It was shot Tuesday at the Myrtle Avenue and Broadway J-M-Z station in Bushwick.

The man was rushed to Kings County Hospital at around 12:30 p.m.

“That looks like K2 bulls–t!” one commuter can be heard shouting in the video.

Another witness then tries to assure the rail zombie that he won’t be squished by a train.

“Someone’s coming to help you. Try not to move,” she says. “The trains are not even running.”

The neighborhood is a notorious hot spot for the crazy-making synthetic drug, which has caused dozens of overdoses in recent weeks. Users have been spotted passed out on sidewalks, twitching or foaming at the mouth.

A restaurant near the subway station even sells the drug, one neighbor said Friday.

“Downstairs they sell it in the deli,” said Lucas Toledo, 30, who works nearby. “It’s been bad. When someone’s smoked it they’re completely lost.”

A 48-year-old woman suffered an asthma attack in the area at the same time that may have been linked to the drug, police said.

Meanwhile, at least two more crazed K2 users were reported in Brooklyn within hours of each other Friday, according to police and other sources.

One of them was wrangled naked near Glenmore and Snediker avenues in East New York and hospitalized at around 11:55 a.m. The other was spotted passed out helplessly on Bedford Avenue and Herkimer Street in Clinton Hill.

The Brooklyn subway zombie footage was shot by Taiberious Carr, who posted it on Facebook with the hashtag “Zombieland.” It had been viewed more than 238,000 times as of Friday.

Commenters bashed Carr for standing idly by during the episode — but he fired back, saying he and others called cops to report the incident.

“Everyone there called the police including myself. For the idiots saying ‘jump in and help’ I damn sure ain’t no paramedic,” he wrote.

“Yes it is K2 they smoke it everyday in that very subway,” he added.

Other straphangers said K2-riddled subway station often looks fit for a scary movie. “I work over here as a nurse. I see them all the time,” said one nurse, who lives in the neighborhood and asked not to be identified. “I [saw them] in the J train smoking a few weeks ago.It’s like they’re hallucinating. They’re swiping at stuff. Seeing stuff.”

Last month, three K2 users passed out on Crown Heights sidewalks after suffering from suspected K2 overdoses.

More than two dozen people also overdosed on K2 the same week near an infamous Bedford-Stuyvesant deli.

There were no K2 related arrests tied to the incidents in Brooklyn Friday.

Additional reporting by Jennifer Bain