Well SPORBUST has some nice BNSF Loco's, you could try his site at: www.SPORBUST.com.
If you're willing to pay $5 a piece, Phil Campbell has a lot of very nice "refueling" BNSF's at his site: www.WorldofTrainz.com.
VMD has nice payware BNSF's at www.VirtualMotiveDivision.com.
Oh, and for a super detailed BNSF SD40-2/B go to www.USLW.net.
Happy Trainzing,
wridenour