As for models for the coaches, you have a tough decision to make. The coaches are originally DL&W "Boonton" style coaches. They are unique because they are steel (as opposed to wood) construction, but they have open vestibules. The coaches were, if memory serves me, the very LAST order of coaches with open vestibules. After that, all steel coaches had closed ones with doors on the sides.
As for models, aside from brass you are out of luck. For HO Scale, Funaro and Camerlengo at one time
offered resin kits for the coaches, as a one piece kit. They stopped producing them about 6 or 7 years ago, but a look in an old Walthers catalog from the mid to late 1990s will show them. F&C has told me over the years that the kits are being "retooled", and I have letters from them to the same effect, but every year when I talk to them I am always told "we are working on them." Maybe if more people ask them, they will put them as a priority. They never (as far as I know) made combine kits for them, but I suppose you could kitbash them if you find an old kit, or if they produce a new kit.
If you don't really care about being perfect, any model of an open vestibule coach would work. The A&A's old layout even used Bachmann old timer coaches. Another idea would be to models of steel closed-vestibule cars and cut up the ends to "open them up." I did this with some Athearn HO cars that I was working on. A link below shows how I started it. I gave up the project when I began building the train in large -scale.
http://rides.webshots.com/album/2262454 ... h?start=12
If you want to scratchbuild the cars, there are articles about the "boonton" style coaches in general in different magazines. I know Railroad Model Craftsmen did an article in the mid-1980's I think. I have it, and if you want to know more I can look up the issue date when I get home. It has some information about the cars (when they belonged to the DL&W, not the A&A) as well as a scale drawing of the coaches.
Finally, when it comes to the paint schemes, I asked this myself last year and never got anywhere. I don't know when or why they changed their paint scheme, but perhaps someone else can answer it. I want to know too!
Benjamin L. Maggi
A&A Railroad Forum Moderator