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 31.6AB W121 32.8CD
A, B, C, D = From 1(D)0(C) to 1920, the population of this area doubled from 1,(A)98 to 2,638. The West Sacramento post office opened in 191(B).