A maniac randomly shoved two straphangers – including an 83-year-old man – onto Upper East Side subway tracks just before noon Sunday, cops and law-enforcement sources said.

The elderly victim and a 31-year-old man were separately waiting for a train at the Lexington Avenue–63rd Street station in Manhattan around 11:40 a.m. when the fiend came up from behind and thrust the two onto the rails below, police said. 

People waiting for and riding a subway train at the Lexington Av-63 St station.A maniac randomly shoved two straphangers – including an 83-year-old man – onto Upper East Side subway tracks, cops said.

The shoving appeared to be unprovoked, sources said. 

An NYPD police vehicle parked near a subway station with construction scaffolding.The suspect ran off before he could be apprehended, cops said. Peter Gerber

The suspect then ran off, leaving the two men stranded on the tracks, cops said. 

Good Samaritans quickly swooped in and saved the duo before the next train entered the station, cops said.

The two victims did not know each other, and no train was entering the station at the time, according to authorities.

EMS arrived at the scene and took the two men to Cornell Hospital, where they’re in stable condition, according to authorities. 

The shover is still on the lam. He was last seen wearing a gray jacket, red hat, tan pants and green shoes, police said.