I thought I read in Trains magazine that BNSF had either retired or stored all locomotives older than SD40-2s, or had put them into their “Surge Fleet” to be used only when demand was high.
I ask because I have seen an old SD9 (#6131) in BN green working the branch to the Coors factory in Golden, CO, near the Colorado Railroad Museum. I’ve also seen an SD9 in BNSF Heritage colors shoving a cut of cars back and forth in the BNSF yard north of downtown Denver.
I’m assuming the second one is an SD9, I really wouldn’t know an SD9 from an SD7 or other early high-nose SD models. The first one had “SD9” painted on it near the front, the second one I saw from a distance…