During a multi-day blizzard in February 1910, a passenger train and a mail train got stuck in Wellington, Washington, high in the Cascade Mountains. Once the snow finally let up, it changed to rain—with tragic consequences. Early on March 1, an avalanche threw the two trains off the tracks and into a valley below, killing 96 people. It was not the only deadly avalanche in the area that year—one struck British Columbia three days later. How did the disaster change railroading in the Cascades?