Don Strack has some information on his Utah Rails site. And he gives evidence some twin hoppers from the B&LE were leased and speculates about a possibility of triple hoppers as well. I am remembering that B&LE may have had triples of two different designs, the 90 Ton like the Ulrich and a 70 ton design? Wish I could be more helpful but I've not been digging into this lately. Link to Utah Rails.