|Faction||Global Defense Initiative|
|Researched By||Tech Center|
GDI's first railguns were seen during the Second Tiberium War in the Mammoth Mk.II. Now, they have increased their railgun production, and many GDI ground vehicles can be upgraded with them. Once researched, Titan, Mammoth Tank, Predator Mk2, Colossus and AA Battery gain railguns to replace their cannons. Railguns deal more damage than regular cannons, and are also more accurate, making anti-infantry combat for vehicles easier.
- This upgrade is still referred to as "Rail Guns" in the description of units and structures.
|Global Defense Initiative Tiberium Essence Arsenal|
Wolverine • Titan • Goliath APC • GDI Harvester • Falcon • GDI Mobile Construction Vehicle • Surveyor • Tempest MLRS • Disruptor • Juggernaut • Mammoth Tank • Mobile EMP Cannon • Mammoth Walker Mk. II • Predator Mk2 • Colossus
Vulcan Tower • RPG Tower • AA Battery • GDI Tiberium Silo • GDI Wall Hub • GDI Gate • Sonic Emitter • Firestorm Shield Generator • Ion Cannon Control Center • GDI Outpost • Foxhole • Support Battle Base • Combat Support Hospital
Sensor Pod Upgrade • Sub-Calibre Rounds • Reactive Armor • Stratofighter Upgrade • Composite Armor Upgrade • Scanner Packs • Auto Injectors Pack • ECM Container • Advanced Fire Control • Railgun Upgrade • Shockwave EMP Warheads • Advanced Turbines