I did it 3 times back in the early 90's, using the train every time. Not sure if or how rates have changed, but the freight was cheap IF you were riding the train up. We took big tents, STEAKS, potatoes, beer, whiskey, chairs... we got treated like rock stars on the open cars on the train, scouting on the way up. If you're in to the novelty of it, I don't think there is any more FUN way to do an awesome, decadent, RAFTLESS overnighter on the Animas. We ran the R.Box and just hiked out each time, no big deal. Things may have changed since then, but the railroad was way cool with us using their services, and telling us the best time to hike out on the tracks.
So many rivers, so little time..........