
Vacant lot on the extension model of my LAJ layout.
The key to realistic composition is to model the typical, the ordinary, what the eye subconsciously expects to see. In our world, a common element is the mundane vacant lot. Personally, I find these trickier to pull off than you’d think.

A typical open lot on the Santa Fe in Los Angeles. Studying photos answers a lot of questions. This is the one I’m working off of.
After years of trial and error, here is where I am on the learning curve. By sharing this, hopefully I can shorten your curve!
Some observations:
-As the base layer, you want to work with extremely fine material. This means grout (sanded or unsanded) or powders as opposed to ballast.
-You want to strive for subtle variations in color, and you want the transitions between these variations to be feathery, with no hard edges. The color variations should be very slight, just a hair of a slant in hue one direction or the other. Nothing harsh.
-You want just a hint of variation in texture on the top layer. Not much. Just a few larger grains here and there.
-Working with fines is tricky. You want a perfectly smooth surface with no brush marks, no hills and valleys or high spots, and no adhesive “craters.”

Key materials ( in no particular order): Fine mister bottle, large bowl of your base grout mix, smaller cups of slight color variations, a soft fan brush, Arizona Rock and Mineral “Beach Sand”.
Here’s the step-by-step of how I did the lot in the lead photo:
-Mix up a decent-sized bowl of your base lot color. For LA, I used PolyBlend “Haystack” for the bulk of the material. As is, the color was a little too bright out of the package. To knock the edge off, I mixed in a bit of PolyBlend “Natural Gray” until I noticed a slight color change to “slightly grungy”. This will be the bulk of the material for the lot coverage
-To give slight color variations, I poured a bit of the base color into a separate cup and added a little more Natural Gray to make it darker. I poured more base color into another cup and added a bit of PolyBlend “Coffee Bean” to give another hue. Just a touch until you see the color changing.
-Now for the application. Make up a dilute mix of matte medium (I part medium, 2 1/2 parts water, a tiny drop of dish detergent). Using a wide, flat brush, spread a thin layer of medium over your work surface.
-The grout application method is crucial. Do NOT use a cup or spoon! Taking the finest mesh sifter you can find, lightly sprinkle the base color of the lot over your surface until you have full coverage.
-Now, go to your two color variants and lightly sprinkle a bit here and there from fairly high up (twelve to fifteen inches). You want to avoid noticeable edges in the color transitions. If you so see the edges, soften them with another sprinkling of the base.
-For texture variation, I took a tiny finger pinch of Arizona Rock and Mineral “Beach Sand” and dropped it here and there from about eighteen inches up.
-To get a final adhesive seal, obtain a very fine mister bottle. Further dilute your matte medium mix by a third to a half, and spray it over your surface.

It’s common to see gravel piles here and there in industrial lots. Using a medicine cup, I poured a few using Arizona Rock and Mineral “Northern Pacific” HO ballast as the blend.
Still to be worked out are the tire marks in the gravel. Not easy! I’ll experiment with a few methods on test samples first. i.e. the layout is NOT the place for testing! I also need to add some vegetation, old tie stacks, etc. Stay tuned.








