The Gold Hill line preparing to fill the valleys with fill dirt.  Miles of wooden trestles were constructed here as in the lake area.  The Gold Hill line as they called it ran from Pedro Miguel to the Summit area.  They originally thought of running the rail line along the Canal bank, but due to the unstable ground with slides, the line was moved to behind Gold Hill.  Deep ravines and valleys were the challenge along this route.  The Gold Hill line had the steepest grade on the Panama Railroad.  As the train left Pedro Miguel, it would have to pull hard to get up to the level of Summit, the railroad's highest point.  You could always smell the brakes when coming to a stop at the Pedro Miguel train station because of the constant braking as the train came down this same steep grade.