Interesting Clue in brookefields(BIP) form 20-F" Our integrated petrochemical facility, which is nearing physical completion, is located in Western Canada and benefits from high volumes of propane production in the region which supplies low-cost feedstock to the complex. The complex is connected to existing rail infrastructure providing transport to end-users in Midwestern United States."
Could be a possiblity that they plan on using Superior as a means of delivery in the states which connects to their rail system.