BNSF 9960, 9583 and 8930

So, I'm still trying to figure why the Great Falls subdivision is suddenly seeing a number of empty unit coal trains returning to the PRB from the west coast. I don't know if it's a shorter route, or if there's work on another route or what. I haven't seen any westbound loads so far, just east/southbound empties, so they must be going out by a different route.

Anyway, this is BNSF SD70MACs 9960, 9583 & 8930 pulling into the Great Falls, MT yard on September 4, 2008 with an empty string of coal gondolas.

Canon EOS 350D Digital Rebel XT
Canon EFS 18-55mm lens