I was thinking about the 645 diesel. The quest is why EMD did not design a new engine with more reserve capacity. One thought is the compatibility with 567 parts. Other than that advantage, is seems odd that they had to go to 20 cylinders so soon after the model was designed. Both the GE FDL, and Alco 251 were able to be pushed to much greater capacity.
Even the advance to the F version of the 645 was not totally reliable. The result was to enlarge the same basic design to 710 c.i.d. What are your thoughts on this?
Even the advance to the F version of the 645 was not totally reliable. The result was to enlarge the same basic design to 710 c.i.d. What are your thoughts on this?