The longest route on Svarog. It only accommodates trains, and the massive underground tunnel has two lanes on either side to allow trains to pass.

It is approximately 1750 kilometers long and fully underground. The Überdiapir Zeta and Aschewolke Range landforms are the two primary causes for the extreme length of this single rail line. Without the trains running through Route Endurance, the Arcology of Kei Zentrum would eventually starve.