of the few cars that I thought to look at I saw a horn and lights on them even if they were not in the lead position. my assumption is that all the cars have the loco controls at one end, so does this make them "cab cars" vs. just "passenger cars"?

edit, after looking at pics of them, the control end is the "A" end, none of the 700 series cars have horns, lights or the windows on the "A" end, so as of now my guess is the 600's are the "cab cars" and the 700's are just normal cars.

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A BNSF fan by default.