On a cool October morning, Union Pacific 8598 emerges from a dense fog as it highballs Truckee, California. Dense fog is common in the fall as nighttime temperatures begin to drop. As the cold air mass moves in, temperatures of the nearby Donner Lake are slow to react. This causes a temperature differential between the air and the lake water, which can lead to the creation of localized fog throughout the Truckee and Tahoe region. This train has a special visitor on the nose, a stuffed animal who's meaning and or purpose is unknown.