It was N013. Those hoppers only belong to the Seminole Electric Generating Station. They may have DPU if they demand more coal but sometimes they can be short like in this case.
Yeah, You better have some time if you want to spot from the viewing area. Runway 14/32 is the one your seeing from the observation area that he was recording. Unfortunately, 90% of the flights use the longer runway 8/26 which they have no viewing area for..sometimes, if your lucky and catch it right they'll send a few that way