Unfortunately... CUS does not appear to have participated very much in this:
https://www.reuters.com/article/2014/12/01/canada-crude-railway-idUSL2N0TL19Q20141201
"Gibson Energy Inc and U.S. Development Group's new Hardisty, Alberta, unit train terminal, which can load up to 120 rail cars, or about 70,000 barrels of crude, in one go, opened in June and ramped up rapidly to full capacity of 140,000 bpd.
Canexus Corp also reopened its Bruderheim unit train facility near Edmonton, Alberta, in early September after a summer shutdown.
However, in its latest earnings release Canexus said it loaded five unit trains in the third quarter, well below its intended 70,000 bpd capacity."
It isn't clear the total capacity of a unit train for CUS. Digging around the internet it ranges 90-120 rail cars.