
I made some notes when we traveled in October; but now I'm wishing I had been more specific when I wrote them. Here goes.
Car numbers in order from front of train to rear: 5245, 5243, 5241, Lounge car, Dining car, 5240, 5242, 5244.
(So yes, 5241, and 5240 are split by the lounge and dining cars.)
5245, 43, 42, and 44 have sleeping suites lettered A-E, and roomettes numbered 1-10 upstairs. Suite A is (I believe)in the front of the car and so over the wheels, which makes for a bumpier ride. Suite E would be preferred as it's in the middle of the car and ride should be smoother.
I believe roomette 1 is in the middle of the car with roomette 10 being in the rear of the car (again over the wheel). BUT I'M NOT POSITIVE OF THE NUMBERING, you might want to check on that. If you find out differently, you can PM me and I'll edit this post.
Roomettes 11-14 are downstairs.
5240 and 5241 Have suites upstairs lettering A,B,C,D,E,J,K,L,M,N.
E and J would be preferred in the middle of the car. N's seat faces rearward.
One of the conductors thought that it is quieter in the cars farther away from the engine (less locomotive horn noise).
Cars closest to the dining car will have more foot traffic.
Car 5244 should have almost no foot traffic, as it is the last car in "first class"; unless someone is just having a walk and look around, none of the coach traffic comes forward and none of the first class traffic travels rearward.
It might they just fill up the suites/roomettes from front of the train to the back unless there is some specific request and that's how you managed to get one roomette in 5241 (which may have filled up that car), and then the next room in 5240? But I don't think that's necessarily it, because they need to spread the workload out amongst the pursers/attendants.
I'm pretty sure you can make specific requests though. We were assigned a certain suite when I made the reservations, but when we got to the station in Sanford we were early, and the train wasn't full, so I asked the gentlemen checking us in what he preferred in a suite and he moved us out of an A suite and into a C suite in a car further from the front of the train.
http://trainweb.org/crocon/sleeperplans.html
These folks would know the answer to your question.
http://discuss.amtraktrains.com/index.php?/forum/78-amtrak-faqs-first-time-rider-info/