The Mystery Train that runs down the middle of Hancock Street

I wonder if everybody has a train that makes bellows and whistles as it runs by their bedroom in the middle of the night? And this train always seems to head South, never North.  There are only two places that the train can stop when heading South and that is at the Marine Base at Cherry Point or, at the State Port Authority in Beaufort.  What mystery cargo does it carry on it's long chain of cars?  When does it turn around to head back North?  Why is it that the creaking, and screeching and bellowing as it slowly rolls through town settles in to become a layer of consciousness in my dreams?

But then, when was it that the sounds of the rolling train were ever really not there, in the deeps of my consciousness?