Once the track is in place and functioning flawlessly, I put most of the plaster-on-screen landforms in place (otherwise, much of the ballast would have slid off the cut-out plywood roadbed, and through the open grid benchwork).
Following that, I paint the rails using a 1/2" chisel-type brush, and once that’s fully cured, it’s time to ballast.
I generally ballast in 10’ or 15’ lots, including turnouts and double track.
Painting rail and adding ballast is the biggest bang-for-your-buck that you’ll ever get in model railroading, so why put it off? It’s very low-tech, and also very relaxing to do, and can be done anytime…for 5 minutes or 5 hours-at-a-time (or more).
Here’s my procedure for ballasting:
I keep seeing comments about people dreading having to ballast their tracks, or, from people who’ve tried and not had success, about what a crummy task it is. What follows is my procedure for ballasting - there are others that work as well, but this one uses readily-available and cheap tools and materials. And it works!
The choice of ballast is up to you - I use both Woodland Scenics Fine Ballast , and real rock ballast, too, on my HO scale layout, but there are many other brands and sizes available, and plenty of colours. If you use natural materials, like sand, dirt, or decomposed rock, it’s best to use a magnet to remove any magnetic inclusions that might possibly damage the motors in your locos.
To ballast your track, I find that a small paper cup (such as those kitchen or bathroom Dixie cups) gives you great control over where the ballast goes. I usually move the cup along the centre of the track, tapping it as I go, to keep the ballast flowing. Less than you need is better than too much, although a soft 1/2" brush is useful for pushing around the excess or levelling what’s in place. Don’t use the brush to brush the ballast around, especially the WS ballast, as it’s very li