Two young women randomly pummeled a 30-year-old female straphanger in a vicious attack on board a Brooklyn train this week, cops said. 

The victim was riding a southbound No. 4 train approaching the Grand Army Plaza and Flatbush Avenue station around 12:30 a.m. Oct. 11 when the duo approached and started punching and kicking her, authorities said. 

The two women – one with wavy black hair and the other with bright red hair – got off the train at the station and fled, cops said.

The victim was hospitalized for bruising, and scratches to her left arm as well as a cut on her lip. 

The dark-haired attacker was last seen wearing a gray zip-up long-sleeve shirt, black leggings, and blue sneakers.

The red-headed ruffian was last seen wearing a gray top, blue jeans and white sneakers, cops said. 

No arrests have been made.