Painting the rails and ballasting are two simple operations that give you more “bang for your buck” than almost anything else that you’ll do on your layout.
I don’t use a noticeably reddish rusty colour, although greys, various browns and blacks seem to work well, depending on the areas where they’re used. For most of the original portion of the layout, I didn’t bother painting the ties at all, but did darken the ballast, using diluted India ink, at most turnouts.
On the partial upper level, much of the track is on Central Valley tie strips, and I did paint some of the ties to denote both newer and older ones.
Using a small brush requires dipping it frequently into the bottle for re-loading, and turns a simple task into a tedious one. I use a 1/2" chisel-type brush for rail painting and it makes the job much easier and faster, as the brush holds more paint, requiring less frequent re-loading
My layout is an around-the-room type, and I always paint the normally-unseen side of the rails, too, which allows you to place your camera on the layout, facing towards the aisle. This gives you an opportunity to see your layout as it might be seen by an LPB that you might otherwise photograph from the aisleway.
I’ve used both Floquil, Pollyscale, and various craft paints for therail, and the Pollyscale was by far the easiest to use and the most durable. If you can still find Pollyscale paint in your area, but not in suitable colours, you can use a combination of otherwise unsuitable colours (red/yellow/green/blue, etc.) to create suitable greys and browns, and rust colours, too.
My usual practice was to paint 10’or 15’ of track or a single turnout at a time, not worrying too much about getting it on the rail tops or the ties, then using a c