Line Shack doesn't have the thrill of the Serrano Road
/ Serrano Cow Trail
below it, but it will give your legs an extra credit workout, especially if you've already climbed to Four Corners
The northern section of the trail nearest to Serrano Cow Trail
appears to be loose, dark soil dirt, not the typical dusty sandy dirt you see southern section of the trail, or adjacent trails.
The northern section has a short, steep climb/descent. There's a worthwhile view at the peak of this short trail. It's not as high as Four Corners
or Dreaded Hill but if you don't have the time or the energy, it's a scenic alternative.