A decade back, I caught this visitor ambling through my vicinity. We still see NS units, but they were just about a daily spotting back then. Now not quite so frequently. C40-8W #8425 leaving Whitefish, Montana:
I used to see Catfish in ND as well, but they too have tapered off in frequency. Here's one leading a rent-a-wreck at CP 203.0 in Minot.
Unfortunately the pic is not very good... Some 20 or so years ago I had been able to spot a high-nosed GP38-2 behind a pair of UP SD70M at Walong's famous Tehachapi Loop, California. NS's units was really operating in the consist and not DIT.. Dom