UPDATE: Channel 4 tracks down, interviews the woman.

The guy who posted the video of the pummeling on Friday as the train was pulling into Park Street writes:

This was on the Red Line in Boston while I was on the way home from work. This drunk chick spent 5 minutes yell at this guy who brushed up against her dog when going to sit down. As soon as she threatened to hit him, I knew I needed to start filming.

MBTA Transit Police tweet:

MBTA Transit Police are aware of the video and are investigating. Anyone with information can contact us at 617-222-1212

UPDATE: A Salem woman with a dog and the same jacket with a skull on the back has taken down her Facebook and YouTube accounts. A T spokesman said police have spoken to the victim and that he does not want to press charges; if they find the woman, she will be charged with disorderly conduct.

H/t our own Kaz for spotting this - and getting a reply from the T.