A picture of something not seen too often. Usually the Coast Starlight is headed by two Amtrak GE P42DC locomotives. Apparently one had some trouble. Union Pacific loaned Amtrak an EMD SD70M to possibly complete the trip to LA or to get to the next location that had available Amtrak motive power. They obviously would not want the Starlight to be stranded on their mainline interrupting their flow of freight traffic.