This question is part of my series of questions about Jormungandr, the alien Snakebot of Doom.
So far, the SoD has eliminated the majority of the world's land-based nuclear missile forces and the US nuclear manufacturing plants, as well as a good portion of the US' military aviation, artillery and many munitions factories.
With its most significant military threats diminished, the SoD is now ready to move on to making more general attacks towards its ultimate goal of destroying all human infrastructure more complex than a tent or shack.
Its designers intended it to physically roll over the majority of its targets, but its rail-gun capability means that it is actually more efficient to ballistically attack most of its targets .
To that end, as the next task of destruction on its list is to cripple the production of military munitions and vehicles, as well as reducing the ability of humans to build civilian structures, what targets that can be attacked and destroyed by tons of steel shot descending from the sky at several kilometers per second would most effectively cripple the relevant manufacturing capabilities?
Please keep in mind that while power generation facilities may be a tempting option, those are further down the list of targets for the reason that they facilitate electronic communication between humans to which the SoD wants to listen.