They have a line a brushable paints. It covers most of the basic colors and also has many prototype colors as well. (Although for me, one color I would use isn't available in brushable last I checked. Thankfully I still have a supply from a prior manufacturer.)
FWIW, their paints will also handle down to -15 degrees F. Handy when you have to order it when you don't have an LHS.
Can you brush Tru color brand paints? Seems like they are the only maker of RR colors left.