Manufactured from fine grades of Bristol board coated with semi-gloss enamels.
Lettering and heralds correctly styled in full rich colors. Rivets … are sharply raised…. No inks, cuts or type of any kinds are used in the manufacture of these sides.They were reviewed in the same issue of MR. There they note that "The rivet detail on the box cars is reproduced without distorting the surrounding material.... Hearlds and lettering look like the real thing.” They really are quite good sides, perhaps the best of their type ever made in OO.
Their advertisement in the June, 1941 issue of MR lists OO boxcar sides for UP, NP, Santa Fe, NKP, and C&EI. They sold for 25 cents a pair. In my collection I have all of these (two different versions of ATSF—map or no map), plus CB&Q, PRR, and SSW (Blue Streak). This is I believe pretty nearly the complete line but, as with Champion, I really wish I had a catalog listing of some sort. Any additional information readers may have would be welcomed; contact info is in my profile.
UPDATE: I have added a second photo of a car with Scale-Rail sides, this one built by Howard Winther. He did work out the paint match better than me. It can be done and clearly these sides will build up into a sharp car. Also, the full run of these sides may be seen in this article, and the full run of sides is as follows:
ATSF “Scout” 139759
UP “Streamliners” 183617