I live near an intermodal piggyback facility about 15 mins west of Atlanta that interchanges containers between RR and truck.
I know local LE and ptb well.
They are freaked out...because the feds are freaked out.
Since 9-11...there has been a blackhawk flying overwatch. Since about 4 months ago...there has been two...24-7.
I remember there used to be two fire teams in the small weapons storage area ..... they eventually crashed into each other ...:o)
The threats can be many . Some as simple as every nut with a bic lighter sets a fire, wild land and urban on the same day or a complex plan to kill infrastructure such as power, communications , transportation hubs, ports, rail and airfield.....
Then you have to consider the insider threat....like 1600 Pennsylvania Avenue.....