Originally Posted by DCAmateur

I'm just curious how they could know if a passenger hadn't ridden the train. At least from my recollection, Amtrak doesn't scan tickets/boarding passes. So long as either a paper ticket has been issued or a boarding pass printed, how could Amtrak know whether you had taken the trip?

Now, it might be a problem to show up for check-in Newark and have an agent discover, if possible, that the train is delayed and has yet to arrive.