If he fell from opening the passenger door on a moving train, this would be similar to what happened to the woman who fell from the AutoTrain. If this happens this frequently, perhaps there needs to be a safety design improvement on the Superliners. Manual locking of each door would be too cumbersome to implement. A retrofit of a central control lock system for all doors could be expensive. One self-contained solution could be to hook up an accelerometer detector circuit and have the door automatically lock at speeds above 10 mph. Of course, there would need to be an override for safety in case of emergencies in case the accelerometer lock mechanism jams or fails, but the override can be a several step lever turning process that prevents anyone from accidentally opening the door. I'll have to check the Next Generation bi-level car specification to see if it says anything about door opening safety requirements.
You're joking, right?
Not at all. If there have been multiple fatalities from people apparently unintentionally opening the exit door at night, that indicates that there is a safety design flaw. The question is how difficult is it to open a Superliner I or II door when the train is in motion, if you don't know what you are doing?
I looked at the Next Generation Bi-level car specification and Section 8 covers the door systems. The side doors are to be electrically controlled from either a local door control panel or via a trainline command signal from elsewhere on the train. There is wording in it on safety specifications for the 4 side doors such as position sensors to detect that the door is fully closed, zero-speed protection from a wheel slide control unit on each car to deactivate the door control panel system if not at zero-speed, door CLOSE command automatically issued when car motion is detected, and so on. Question is how much of these features are present in the current Superliners?