Site Pylon

Site Pylons are a railway item in Astroneer. They allow for the creation of rail lines, and can be used to recall Rail Engines to the Site Pylon. They spawn on Glacio and Calidor near mission items.

Source
Site Pylons spawn on Glacio and Calidor near mission items, such as Freight Modules, Frozen Argon, Artifacts, and Obelisks.

Uses
Site Pylons will connect rail lines to any other pylon, Rail Post, Tall Rail Post, or Rail Junction. They are best used with Junctions, as the Site Pylons are a dead-end.

Site Pylons may be picked up and moved for better placement of rails.