Franz,
Although all of the more common releases (i.e., assuming any of these early products could really be called mainstream) and the elusive rotary snow plow kit are on hand, I am not 100% certain that unassembled examples of all of the Remington Locomotive Works freight car model releases have been acquired for my collection and/or research purposes.
If the boxcar and/or reefer kits came in a generic white box, with an A&J Models product label, the models were marketed by A&J Hobbies, a firm that was formerly located in Cape Coral, Florida (which is approximately 40-miles from my location).
Run by a pair of really eccentric brothers (now deceased) who had retired from the military, a long-time fixture in Cape Coral, the now defunct business marketed a number of different craftsman kits, in several different scales.
Roger,
Although Mil Scale Products, which only produced HO and N-Scale wood structure kits (e.g., the N-Scale "SN" series car repair shed, covered bridge, snow shed, and small turntable) did not print any address information on their boxes or assembly instruction sheets, I believe the firm was formerly located somewhere in the Midwest.
Well there you have it...
A few more potential articles concerning now defunct, pioneering N-Scale firms:
Mil Scale Products, Quality Craft / Gloor Craft Models, Remington Locomotive Works (who ironically did not produce any locomotives), Wabash Valley Red Ball (Wabash Valley's rolling stock product line, which was marketed alongside the firm's "Hometown Series" structure kits), and the really obscure A&J Models and Swift Line (a small, now defunct, Duarte, California based, N-Scale craftsman freight car and structure company).
NJoy