From what I've read, the A bedroom is somewhat reduced in size at one corner. How much reduction in size & price?I'm assuming this is the reason it isn't a part of Deluxe?
The A bedroom is slightly smaller in a Superliner car. However, in the case of this thread we are talking about a Viewliner sleeping car. There is no difference in size between the A room and the B room in a Viewliner.
With regard to Deluxe, all Bedrooms used to be called Deluxe Bedrooms. All roomettes used to be called Economy rooms.
Putting two Bedrooms or Deluxe Bedrooms, depending on which name you prefer, creates a suite. Used to be called a Deluxe Suite back when they were Deluxe Bedrooms, now it's usually just called a Bedroom Suite. In a Viewliner since there are only two Bedrooms, there can only be one Suite using the A & B rooms. On a Superliner, with 5 Bedrooms available, a choice had to be made as to which rooms had the connecting door. Between the slightly smaller size of the A room, coupled with the fact that the A room's couch is on the wall that the door would need to be in, they choose to make the Suites out of the B & C rooms, as well as the D & E rooms.
I hope that makes sense, but please don't hesitate to ask if I didn't answer all of your questons.