Pollyscale's railroad line is my fave line of paint, period. Best white, best yellows, best blacks money can buy. (at least for acrylics) And most importantly---color! Most "military" lines of model paint only offer greys, greyish/navy blues, and camo green. You're lucky to find more than 1 shade of red, orange, yellow in them.
Try matching "Alto red", "Milia red" and "Hikaru red" with a military line---all you'll get is "Insignia red" which matches none of them. But a model train line will offer many subtle variations of reds, to allow perfect matches. I personally have SP scarlet, Daylight red, SOO candy apple, ATSF red, caboose red, signal red, and Seaboard chinese red.