C.O.L.E.

C.O.L.E.s, or Computer Operated Logistics Engines, are a railway item in Astroneer. They allow for travel along rails, has two small Slots, and provides oxygen to the player. They are faster than a Rail Engine and harmless.

Source
Rewarded from completing the Travelling Companion mission.

Trivia

 * The face of C.O.L.E. is similar to that of the Face Time visor.
 * It represents a smiley emoticon most of the time ).