Hands down, it has to be the GP30 by EMD.
Unique cowling never matched by any other model. Now becoming distinct with polluton controls and modernizing of the big five. I miss seeing them in central Texas. ATSF was the last in the state to have them. One resides in my favorite fallen flag at Pine Bluff, Arkansas. But, it is without a prime mover and has been moved outside. A sad day indeed.
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