@ednadolski - Ed, I've started using True Color paints almost exclusively, except for weathering. They offer a single Railbox Corporation yellow color, and I don't know if it's the dark or light version, and their website is no help.
Other than that, I'm highly satisfied with the results I'm getting with their paint.
Gotta use their thinner for thinning although they claim their paint is "airbrush ready"...I haven't found it to be. Cleanup with plain ol' acetone, which does a great job.
Oh yeah...can't brush it. They make some brushable paints, but their "airbrush ready" paints just don't brush.
Cheerio!
Bob Gilmore