Artillery wagon - Factorio Wiki

The <b>artillery wagon</b> is an end-game wagon mounting a rail cannon that can be added to a train. It fires artillery shells, relatively slow-moving projectiles that explore chunks of terrain they travel across. The wagon gun has both automatic and manual (even longer-ranged) firing modes. Projectiles have sufficient damage to destroy spawners and any type of worm with a single hit, and have a modest area of effect. Infinitely-stacking research upgrades are available for range and firing speed, but not damage.

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Smart Artillery Wagons - Factorio Mods

Late-game automatic killing machine (blueprints included) : r/factorio

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10 Books Full of Rails - Factorio blueprints

Artillery Turrets should have better range than Artillery Wagons

Pocket Wiki for Factorio by Kateryna Momotova

Gelugon_baat's Review of Factorio - GameSpot

Gelugon_baat's Review of Factorio - GameSpot

Just sharing my train mega base running at 1300 science per minute

Factorio Prints: Artillery Train