http://www.terraserver.com/imagery/imag ... ew=A&t=pan
OK Jim, I've seen the move I think you saw also. While storage at Temperance is a possibility, I believe these cars, which came north from Walbridge, were for the Ann Arbor. In order for CSX to get them into Ottawa Yard, they must fly past Hallett, enter the TT, and then enter the siding that dives south off the the TT, just east of the NS Detroit main, as the map shows. I think this siding is double track and allows the power to run around the train, otherwise they'd have to back into Ottawa. It is also a signaled siding and I once saw CSX take autoracks by a yellow signal southward on this piece of trackage. I posted on this sight and someone said they were for the AA so I'm guessing the same is true here.
On the map (sorry but you have to pay to get a closer shot) you can see this piece of trackage that actually once served several businesses as it curled almost, or perhaps a complete loop around the area.
I am not positive about what I have written but it's my best guess, I also hope we hear something for sure because this move caught me by surprise when I saw it.