"The Four Steps"

"Now, i ask you to taks the Sacred Steps, in union with the Eternal Engine... These Four Steps represent the path humanity has taken. From Grass, to Ice, from Ice, to Steel. And from Steel to the Lights, of the Eternal Engine." - Mr. Wilford

Lilah Junior and Ozweiller performing Mr. Wilford's First Class Tradition, "The Four Steps."

The Four Steps appears to be the official tradition First Class passengers make when they are married inside Snowpiercer. LJ Folger and Ozweiller are the only ones shown in the series to have experienced the Four Steps (and the marriage ceremony in its entirety).