A tattooed woman with green and blonde hair randomly pummeled an elderly woman inside a Midtown train station last week, cops said.
The 73-year-old victim was riding a southbound E train approaching the Fifth Avenue-53rd Street station around 4:30 p.m. Thursday when the bright-haired stranger sat down next to her and started yelling, police said.
When the alarmed victim got off the train, her crazed seatmate followed and repeatedly punched her in the face on the platform, cops said…