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https://www.esparail.org/resources/climate-change-and-rail/ (you need to scroll down a ways) indicates that at least under electric power, there will be three powered trucks. In theory, if you're traction limited instead of horsepower limited such as when accelerating from a dead stop, trying to avoid wheelslip, you might see a benefit from running the third powered truck. Additionally it may be helpful to dynamic brake via the APV axles in addition to the locomotive. However once you're moving you won't have enough power from the diesel to run every traction motor - they don't say one way or the other but I'd be very surprised if more than two trucks were powered most of the time when using the diesel.