Perpetual motion

Perpetual motion is the motion of bodies that continues forever in an unperturbed system. A perpetual motion machine can do work infinitely without an external energy source. This kind of machine was impossible with the old laws of physics, as it would violate the first or second law of thermodynamics, and only came about with the new laws of physics and access to 7d.

The Snowpiercer has a perpetual motion engine.