Dale,
I have used Tru Color and like it a lot, other than the inherent odor. It sprays very well out of the bottle, dries fairly quickly and does cover well.
Alternatively, I now use Badger Modelflex colors which are an acrylic with virtually no smell. Modelflex covers as well as tru color, is comparable in so far as cost goes, dries very quickly unless you add a few drops of Badger Extender and sprays well out of the bottle at around 35 psi. I do add a few drops of Testors Thinner but that is a personal preference. They also have Railroad specific colors along with other colors.
Modelflex is now my preferred spraying paint but mainly due to the lack of odor. When all is said and done though, both are very good paints.