The attacker – named as Bulgarian Svetoslav S – was captured on CCTV sneaking up behind his victim and at Neukölln station in Berlin and launching a hard kick right at her back, sending the petite blonde flying face-first down the stairs.
His surname has not been made public due to strict German privacy laws.
The 28-year-old, who was smoking a cigarette and drinking a beer at the time, was then seen calmly walking away from the scene with three other men.
The attacker follows the girl down the stairs with his mates
He kicks the victim in the back and then walks off calmly as she lies on the ground