Final color of the retaining wall. Used a spray can "primer"ly color. Had a can of black thinking to add some hi-lites to the stone but that paint started to dissolve the surface on a test piece a bit, so went with just one color.
Another segment added to the HO helix awaiting track installation. Looks like its just about ready to connect to the upper level. Will be interesting to see how the helix to the lower level will be built.