Here in Chicago, year after year, old EMD geeps and switchers, 1st generation ones especially, have been disappearing. Are these older units serviceable, as in Are parts till available for them, or are they all just going to die sooner or later? I know atleast some 567 models are unserviceable. Its getting to the point now where they are really only seen in isolated pockets.
The problem with first and second generation power is, they are no longer EPA compliant(tier 2 compliance).
and as soon as engine work is needed only a part of engine can be replaced each year, I believe is 1/8 of amount of power assemblies per calender year.
so if more than the allowable amount of parts are needed, you need to wait till next calender year to replace the excess parts.
Both the 567 and 645 engines are in this EPA spectrum except for a few newer 645's in commuter operations (different rules called tier 0)