Originally Posted by Dominic Mazoch:
Many railroads retired non rebuilt GP/SD7/9's due to a lack of or the cost of parts!
Not quite true. There never was a parts supply shortage from many, many, many suppliers other than EMD for the 16-567 engine. Also, many large railroads chose to trade their GP7/9 units into EMD for GP40-2 and GP50/60 units.
There is still no shortage of new, remanufactured, "running take out", or unit exchange engine components available for the EMD 12 and 16 cylinder 567 and/or 645 engines.