@Helmut - great observation on "boot leg"
@Doug - The sign is relatively easy to do. In this instance I wanted a specific name for the industry. Good friends and fellow model railroader Rusty Westermeier and Wife are who the industry is named after. I used Word Doc to print the lettering on a piece of bond paper with an inkjet printer. I can select any font and size to make the lettering. After printing, I positioned a piece of wrapping tissue over the lettering. I tape the leading edge with a couple small bits of scotch tape and reinsert the paper in the paper tray and print again.
I let it dry well or you can lightly spray it with Dullcoat to set the ink to prevent it from running. For this sign I painted the area of the sign white. I brushed thinned white glue over the sign area and gently applied the lettering. I used a small straight edge to gently push the lettering paper into the brick along the horizontal mortar grooves. Then I let it dry thoroughly. After dry I use an exacto to cut the paper in the vertical grooves and reapplied thinned white glue. Then gently pushed the lettering into the vertical grooves. Once dry I overspray with Dullcoat.
This technique also works well to print period correct color signs. I look on internet for signs to fit my needs - copy, resize etc.
Closeup shows how lettering appears 3D on brickwork. The thin tissue is transparent enough to get lost on most surfaces. If desired a little touch up with paint can cover any gaps created when cutting tissue with the exacto.
You can apply to any surface - billboards, buildings, rolling stock. In a large scale I used this technique to copy a photo image of a face onto a figure. Put my son in the scene!