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Yor suggestions make sense, i would take into account though that where there are Warrant Officers in a Town or Outpost it would also be realistic that they may have carried out some degree of maintenance, such as the light globes etc.Some level of maintenance increases security for the staff that are manning the area.Based on the back story i am not sure if trains and train tracks would be damaged, probably the only reason they wouldnt be functional would be that in outlying areas there may be little power generation to run them.I would imagine around the major city, such as Saransk they may have been able to power them, depends on whether they have got stable power generation.But if you can run a forcefield you probably have stable power generation, at least in some regions.
And then there's the raiders. If i understood it right it's the soldiers who's brains got fried, left wandering around since the catastrophe. Sounds credible, but... how come their uniforms are still clean and not dirty and tattered? A hidden military service station or warehouse in the wilderness, stocked with spare uniforms? Yet another confusing detail.Why not just give it up and make the whole world (outside those aforementioned special areas) unambiguously decayed/deserted? In this case all will be self explanatory and easy to understand even without any backstory.
Saransk video
Videos are set to private, not sure if it was intentional.