The accommodation charges were per room, not per person, back as far as I can remember. It didn't change in 2001.I just started researching the two fares for what used to be available for one that people wanted to know where I found it. Here is a quote from and amtrak review around 2001. It talks about how people are charged double the fare for a room where they used to be a fare for one. Probably some clearer articles but at the moment I don't have time to look for them.
"One for the price of two
The price of a bedroom always builds in the cost of “complimentary” dining car meals for two people, even when only one person is traveling.
Many sleeping car veterans have decried this Amtrak version of the “single supplement,” especially after the retirement of older, more economical Slumbercoaches and Heritage Roomettes. Management argues that if someone will pay and the car is sold out, why cut the rate just because only one person is traveling?"
Pretty much eluding to the point that the charge used to be for one person, not two.
That was the case even before they started including dining car meals in the fares in the 1980s. I remember it very well, because the accommodation charges went up by a very close approximation of the cost of meals for two for the period of occupancy.
I didn't like it then, and I don't like it now, but it didn't represent a basic change in the single accommodation charge.
I wish they'd go back to charging for meals separately.
You need to cite something else. Ive been riding since Amtrak started, and there was always a single accommodation charge for each accommodation type. Back in the 70s there may have still been a surcharge on the rail fare for occupancy of an accommodation with more capacity than ticketed passengers, but that was gone fairly early on.