In response to Salvagni question regarding cleaning the rail prior to painting, I did nothing beyond the normal cleaning with denatured alcohol. For paint I used Joe's Model Trains Dark Brown Rusty Rails paint. http://www.joesmodeltrains.com...at_acrylic_paint.htm
Cleans off the top of the rail easily with denatured alcohol and clings to the Fastrack pretty well. I tried using their painter device, but couldn't get it to work very well and ended up brushing it on the rails. End product looks a lot like Surefire's pictures above.
I would suggest not painting the center rail. I only painted the sides of the outer rails after experimenting with painting all 3 rails. In my opinion, your eyes are drawn to the painted rails versus the unpainted one. The unpainted center rail blends more into the background.