BNSF 2697 is a former GP35, that has been rebuilt as a GP39-3. You can clearly see where the smaller center radiator fan on the long hood was once located. I suspect it was removed to reduce maintenance costs, as the fan was a different size. I find it interesting that UP got rid of all of their old GP30s and GP35s, while BNSF opted to keep much of the power, simply rebuilding it.
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