Michigan hump yards?

The Michigan Central had 3 M-class 0-10-0 switchers 8790,8799,8991 and 2 NU-class 0-8-8-0 switchers 8700,8701. It is my understanding that these locomotives were used in hump pusher service. My question is - Where were hump yards located in Michigan?

I think that was a hump yard at one time..

JUNCTION YARD IN DETROIT, and NILES,MICH were the only ones I recall. JACKSON was a flat swt yard, as were all others. LAB

You can get a good birds-eye view of the Niles yard, including humps, in the most recent Classic Trains mag.