Yes. I think that quite frankly, if the world were not still in a COVID-19 world that we'd see substantially more volumes running is still a fact that, at least in the U.S., that retail gasoline sales and diesel sales were basically 10% or 11%, below where they were a year ago. Jet sells are probably 60% or 70%, below where they were a year ago. So the demand for refined products is still being dramatically affected by the effects of COVID-19. So currently, what we look at is and think about is the WCS in Hardisty, Alberta versus WCS in Houston, if that is kind of in the $12 to $15 range. Then, as I say that seems to support the movement by rail and our particular situation our customer, which happens to be ExxonMobil, built up credits, in essence, by paying for volumes that they didn't take or use in primarily the second and third quarters in 2020. And they have four quarters after each quarter to -- in essence, make it up. So, right now, they are moving trains, but we're not really getting anything because it's from a margin contribution, because it's they're really making up the prepaid volumes that they paid us in 2020. Now, the question is what happens in the back half of the year after that bank is used up and if the differentials continue to exist, and there's a recovery in refined product demand, which would therefore result in refinery utilization increasing and we can see that that would continue through the back half of the year and it would be a net positive to us in the back half of the year. Relative to, I mean, I think the viscosity is important to the Gulf Coast refineries represented by the heavier Canadian barrels in terms of optimally loading their FCCs and [cohors] [ph]. But again, all of that is kind of dependent upon dynamic associated with what's the refined product demand coming out of the back end of the refinery. So we're being basically in our in the guidance that we gave, we're basically kind of assuming that it's -- the volumetrically it's basically flat to what we're currently moving. But as we get to the back half of the year would be a net contributor whereas on the front half of the year, it's not really flowing through the financial results because of the bank of dollars that they are working off.