In order to send a message on Tumblr, you must have a user account. Once you have one, you can contact the OP directly. You can send an anon message without an account, but that's useless in this situation.

As soon as I saw this post, I contacted the OP. He confirmed it did happen. He contacted the MBTA to report the situation. As far as I know, nothing has happened.

As for whether or not the person who yelled at the young man in question is a cop or not, it may have been a misunderstanding. The person who yelled was a T employee and at the least should be contacted by his superiors to follow up. I have tweeted at the MBTA several times about this situation and have not gotten a response.

Hope this helps.