I wondered what the deal was with the car bodies. I figured the mining company did a major "clean up" of Rico which basically destroyed any RGS artifacts left in the yard.
In addition to the carbodies, there was some sort of home-made pile driver gizmo in the willows, the pits from the enginehouse (with intact rail - still spiked to gauge), and the bulldozed remains of the depot building. The ruins on the hillside was the remains of the Pro-patria mill, which was fed by an aerial tramway that ran down a street of town.