The lighter-weight shorter car is a benefit no matter where it goes, so even on the lighter density lines, although you won't be able to load it to capacity, it's still going to have a tremendous advantage over the existing equipment. You're still going to get more units per train start. And the car is lighter; therefore, that light weight is going to be transferred in the lading, so more grain is going to be carried.
Evidence of meeting #43 for Transport, Infrastructure and Communities in the 41st Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was industry.
A recording is available from Parliament.