At milepost 13.4 we start to see some of the stone work that was put in place along the line. Many of the early trestles were replaced with fill and culvert after the initial construction. This is what I have labeled as Box 4, the first stone box noted on the valuation map. It is described as 2' x 2-1/2' x 80. This image is the northern end of the box. Recent rains have flushed these out well.

One of the things that I love about AZ is found in this shot. The transition zone from desert to pines. This shot is the southern end of the box.