For ballasting I use sandpit sand bought from ToysRUs before it disappeared. It is reasonably coarse so can pass for ballast in n gauge.
One of the things I do not like about commercial N gauge track is the depth of the sleepers. I therefore wanted to use the ballast to hide this depth consistently. After some experimentation I came up with a scheme to achieve this.
Once the track was laid, I lined the edge of the sleepers with evergreen 1mm quarter-round StripStyrene. T