This reminds me of when I worked on the railroad at Albert Canyon, B.C. in the late 70′s. One winter there was a derailment of about 8 grain cars near a switch and tons of grain spilled. In the spring grass started growing and the area began to smell bad. This seems like such a nice little organized pile compared to that, like a deposit of some kind, dropped off as a reminder of the railroad’s glory days, when people looked at the tracks and tried to imagine how the grain came from thousands of miles away.