KF> Well, it depends on the model and economics. GP9's now aren't much good 
for
KF> mainline service, but still are great for switching and shortline duties. 
W
KF> most of the big freight railroads getting out of doing any local service, 
t
KF> makes them expendable. Same goes for yard switchers. Plus, engines like a 
G
KF> are now almost 50 years old (some of them) and are on their third or 
fourth
KF> rebuild.  
our GMDD built locos arrived in NZ in 1955 and lasted untill the late 70's 
before being rebuilt with chop noses, new electics and replaced the 567c 
with the 645 (i think).
We have 85 of these units and only 2 have been withdrawn from service 
(wrecks). They are still the backbone of our fleet and are found doing 
everything. Theses engines are 45 years old and still going strong...
cheers
Andrew
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