Shall I tell 'em Chris?
1150-1152 are Hump Braking Units.
HBU "are de-engined units controlling two SD40-2 units in the 5476-5481 group in hump service br radio signals." (Canadian Trackside Guide)
1152 started life as a MILW GP9, then was a SOO Fuel Tender.
Hey: Got my NEW Trackside Guide today!
So, like somebody's standing nearby with a radio-control rig, flicking the switches and turning the toggles so that the locos move back and forth, etc?
Heck that's not new. I do that every time I play with my model trains!