In 1961, the Sno-Train was involved in Environmental Operation Willow Freeze. At the conclusion of the exercise, it departed Gulkana, Alaska for a contract mission east of Dawson. The Sno-Train image below was captured March 31, 1961. The Sno-Train left Galkana at Mile 117 on the Richardson Highway and cross the bridge at Mile 126.5.

Sno-Train crossing the Gulkana River Bridge, Alaska. Image: U.S. Army 1962 Public Domain