The official low temperature the night before at Pocatello was -6°F, but it was even colder at American Falls, Idaho, the morning of January 21, 2013. A westbound Union Pacific freight crosses the impressive Snake River Bridge below American Falls Dam. Leading the train is UP 6942, a former GE AC6000CW, now labeled a plain AC4400CW, with a Canadian National SD75I, a UP SD9043MAC and a former Southern Pacific AC4400CW trailing. Steamy fog rises off the icy cold river into even more frigid air around the partially frozen falls.
