Most of the GTW through the western Detroit Suburbs was commonly called the "Ho Chi Minh Trail", because if a train ever got stopped along there, there were thieves on them with-in minutes.
So I suspect that is what the HTUA means. But, I will ask someone that worked down there about it.
Also, looking at the Dearborn Subdivision in the Time Table....it runs from the north end of the Flat Rock Yard to the Ford Rouge Yard handling traffic to and from the Ford Plant.
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