This illustrates one of the bigger problems that I see at Amtrak, which is that every two bit gate agent thinks that they can make up the rules as they go along and then throw their weight around about it. Huge discipline problem exists as far as I can tell, having suffered through various aspects of it from time to time, and Amtrak management seems to be totally at a loss as to what to do about fixing it. OK enough bitching for a day from me now :-/
This recently happened to me at LAUPT which is why this topic strikes a nerve. Upon confronting an employee who was improvisationally manufacturing Amtrak policy, she offered several disparate and nonsensical rationales for her directive. And when pressed for a citation where the policy could be corroborated, she demurred and stormed off without further comment. I went on to ignore her original admonitions and go about my boarding.
I don't necessarily advocate calling an employee's bluff in a confrontational manner, but until management gets a handle on Amtrak's loose cannons, I also can't stand by while unchecked egos run amok.