This is a cache along the Clarksburg Branch Line Trail. Solve the puzzle below to find the cache.
This set of caches is on the "southern" (less-traveled) end of the trail. I used my bicycle to place these caches.
N38 31.3AB W121 32.9CD
A, B, C, D = In 2(A=+4)(B=+4)(C=-1)-200(D=+1) there were efforts to move the California Highway Patrol official headquarters from Sacramento (in Sacramento County) to West Sacramento (in Yolo County),[23] but these were ultimately unsuccessful.