CSX 8974 has a 16 cylinder engine now. And all six NS units are mechanically SD40-2's - tho still classed as SD45-2. 1701 already had a 16 cylinder 645 (put in by CR) the rest were done by NS. CSX 8973 is now retired to the REDI center in Atlanta. CSXT has 2 "true" SD45-2's left 8954 and the HLS1 (ex 8969).
Larry
Larry