The only time I saw the MBTA go above 20 MPH (~30 KPM) was in the late 60s or maybe early 70s as a young kid when I lived in the area.
The driver passed out after he emptied his whiskey bottle, we could see it on the floor. The train was going extremely fast, not stopping at any stations. Me and my friends were banging on the locked door to wake him up.
Not long after a conductor came running and unlocked the door to stop the train.
For the MBTA that was just another day, no one got in trouble. There are still big issues based upon what my friends from then have told me. But seems things are starting to change, but very slowly.
Does the MBTA Trains in Boston even have Conductors now ?