And this has been, roughly, the least-covered topic photographically and structurally in the history of train and locomotive documentation.
I don't quite understand why; it is something I try to mitigate on my blog when I can.
With that in mind:
EMD's SD70ACe (the "e" stands for "enhanced") began its life in April of 2003; there are now over 1,400 built.
The SD70ACe is very similar in appearance to the Phase II "true" 6,300-hp SD90MAC locomotive, a dual turbocharged four-stroke diesel (1,010 cubic inches per cylinder):