The railgun is a linear accelerator which functions using standing wave acceleration along a number of cylindrical superconductive electrodes that surround the barrel. It is the most powerful weapon in the Tau armoury. Railguns can be mounted on an XV88 Broadside battlesuit, Broadsides always carry twin-linked railguns. They are also found on the Hammerhead Gunship, the Hammerhead variant is far larger than the Railgun found on a Broadside so it is capable of firing a submunitions shot as well as the solid shot. Railguns are often employed in anti-tank warfare due to their high strength and armour penetration capabilities.

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