The fed-up T rider who snapped a cell phone picture of an accused serial groper who allegedly slipped his hand up her dress said she’s thrilled the fanny fondler is finally cuffed.

“I am just so happy that I even had a little bit to do with helping to find him,” said the woman, who did not want her name published. “I didn’t just give a description. I actually had a picture of his face. That’s what you need to find somebody.”

The daily T rider was on an Orange Line train during the evening rush hour on April 28 when Hugo Hernandez, 22, of Everett, allegedly lifted up her dress and touched her upper right thigh three times.

“I started screaming at him and yelling. Someone in the background said, ‘Take his picture! Take his picture!’ . . . I was shaking and I just whipped my BlackBerry out of my pocket and took his picture,” she told the Herald.

Transit police used the picture for wanted posters that were widely distributed. The woman also posted the image on her Facebook page and on Craigslist.

Hernandez was arrested Wednesday at Sullivan Square station and charged with four counts of indecent assault and battery for similar attacks on Orange and Red Line trains in April, September and October. He is being held on $8,000 bail.

The T is in the middle of a crackdown on gropers, and Suffolk County District Attorney Daniel F. Conley urged victims to come forward.

Police reports allege Hernandez mostly sneaks up from behind - grabbing a woman’s buttocks on the Orange Line in April and fondling a woman on the Red Line in September as she bent over to adjust a backpack.