There are three main tracks at Reno Junction (the entrance to Black Thunder Mine and Black Thunder East Mine) and this BNSF empty is on Main 1. In the Powder River Basin, you can see BNSF loads meeting loads or empties meeting empties because BNSF can access the basin from the north or the south. Thus, you may have a empty enter the basin from the south heading for a mine at the north end meet an empty the entered the basin from the north heading for a mine at the south end. UP, on the other hand, can only access the basin from the south. So westbound (geographic northbound) UP trains are always empty and eastbound (geographic southbound) UP trains are always loaded.
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