I was in North Billerica Station once when someone did that as the northbound train was leaving. He made it out of the train, but had to be taken the rest of the way on a stretcher. A broken leg, I think.

...to get out of Whitman. But never to get into Whitman. People should be jumping on that train and never look back.

you will burn your hand. It was the best advice my grandmother ever gave me.

Don't be surprised if it turns out there was nobody from commuter rail to open those doors or help that family off the train. It happens more often than you know.
They make an announcement to get off only where there is a conductor and don't tell you where that is.

I jumped off a train at Readville in December as it was starting to move. Not my best decision probably. The conductor actually laughed at me.