Did Coal Hoppers Finally get Fixed?(No)

I'm asking if the coal hoppers got fixed, because I'm suddenly having a pleasant experience while driving them on Donner.
It used to be, I could take a 70 car empty train up a 2% grade with only 2 SD40s. The train would practically coast up a grade like that.
Now I need 3 SD40s and a GP9 shoving on the rear of a 80 car train of empty coal cars. Even then I frequently slow to about 17mph on the steeper sections.
I checked to make sure I hadn't modded their mass'.
It used to be, I could take a 70 car empty train up a 2% grade with only 2 SD40s. The train would practically coast up a grade like that.
Now I need 3 SD40s and a GP9 shoving on the rear of a 80 car train of empty coal cars. Even then I frequently slow to about 17mph on the steeper sections.
I checked to make sure I hadn't modded their mass'.