Does anyone know any additional info on these so-called Super Hoppers?
Each of these covered hopper cars appear to be articulated. From what I know they were manufactured in the early 1990s by a company named Thrall. Are they still in service with BNSF? Apparently this type of hopper wasn’t a success, and the only new covered hoppers seen in BNSF service are the ubiquitous 3 bay Trinitys.