I finally girded my loins and stared painting the rails. I always dreaded this but you know what? It's not all that difficult, just tedious. The trick is to completely cover the rail and the clean the top with a paper towel. For paint I used Floqil "Rail Brown." The color is a spot-on match! If I'd know it would have been this easy I'd have done way back in 2009 when there was no ballast or scenery in the way.
As you can see I also weathered the track by brushing on a coat of really dark weather wash down the center of the two rails.