The joint BNSF-UP Orin sub of the Powder River Basin in Wyoming has very little dull moments. Case in point is this three way meet between an empty coal drag, a loaded coal drag, and a rail train. The rail train is actually coming towards me. This is also the only freight only mainline that is 4 tracks for any amount of distance.
Despite all that, I was actually a little disappointed with my time in the basin. It was fairly busy but wasnt as busy as I thought. There was a few times where I sat waiting for over an hour on something! Which is hard to believe railfanning UPs and BNSFs lines that fed into the basin and it being a constant flow of traffic. I was fairly impressed with the Gillette end of the basin but I was busy chasing BNSF trains back and forth.
Either way, its a railfans gold mine, even if traffic is a little down.