Amtrak did? That is news to me!
How is it fair for a single coach passenger to be denied even the most minimal privacy (like an armrest or other divider) on an overnight trip? Amtrak creates a problem (lack of privacy in coach) and then exacerbates the problem by refusing to honor multiple tickets. Either provide some minimal privacy for every seat or allow people who need or desire privacy to buy and use two seats. But no, they can't do either of those things because it's "very hard" to explain an empty seat on a reserved train but apparently much easier to explain why you were spooned or drooled on by a stinky stranger in the night. It makes no sense.
So I guess all those 100+ year old railcars that I see in Rail Museums across the country must all be reproductions. I had never saw an armrest on the bench seats, and since Amtrak created the problem and Amtrak is less than 50 years old, those 100 year old cars had to be reproduced - they can not be original!
Amtrak bought the Amfleet cars, right?
Then they created the problem by ordering cars without armrests.
What other precious railroads did is completely irrelevant.