Modular Landsacape Kit Embankment Spline Double Track High Mid Green Grass
A double track embankment. The texture has been normal-mapped, so you may find a colour variation depending on which direction you extend the spline from its starting point. The trackbed can also double as a roadway, though you'll need to add a traffic spline unless you want it empty or static. Part of a family of related items, which all share the same suffix MGG1: for example, the screenshot also shows a patch of the matching Ground Texture - MLK GT MGG1.