Not sure about the AAA maps. I do not thik they show rail lines. However, most state highway department state maps that they give out in the welcome centers and at other tourist places do show rail lines, at least those in the southeastern states that I am familiar with. Some states have these on line, usually as a pdf file, Mississippi for one, but getting a print out that you can read easily may be difficult. You willl have to check the various state DOT web sites. Some states have a railroad route map showing the various railroad company names on their sites as well. I beleive that Washington state does. Not sure of any of them in your area, however. BNSF railroad has division maps on their company web site that are very detailed. They do not show roads, but if you have any sort of state highway map you can identify the towns and figure out about where the track is. You would need the Northwest division which would get you Seattle to Portland.
www.bnsf.com/tools/reference/division_maps/div_nw.pdf
If you go to it, you can enlarge until you can read the names and milepost numbers and move around until you are looking at the area you want and then do a file print and when the form comes up click on "current view" before hitting print.
The rest is all UP track, which does not have anything equivalent that I have found.
George