Railgun Towers are complex defenses which utilize a beam of highly concentrated psychic energy to punch through armored forces and instantly dismember infantry. The exact technology behind the railgun is kept in secret by Epsilon, however the effects of it are obvious.
Additionally, unlike Tesla Coils or standard Prism Towers, the Railgun Tower is capable of hitting a number of units at once in a small radius. A special version of Railgun Tower can be spawned with the Risen Railgun support power, which will additionally provide healing for nearby units.
Epsilon has drastically redesigned their high-tech defense systems - the Psychic Towers. They seem to be called Railgun Towers now, as they no longer mind control units, they inflict rather heavy damage with powerful mental railgun, created by the inversion panels installed in the tower. When this weapon starts to charge up, one will notice flashes of the panels and focus of energy on the top, in its emitter. This change is most dangerous for Allied forces, as now their Robot Tanks will not be the perfect weapon against Railgun Towers.
As the old Psychic Tower was easily taken out by enemy robotic units, PsiCorps decided to disarm its mind control device, and support it with a railgun instead, which can damage artificial tanks as well as infantry or human-controlled units. The armed Mental Railgun is an excellent armor piercing weapon; its development allowed PsiCorps to increase the maximal range of the Psychic Tower, so now it can target enemies located further from it.