Marion 8750 "Slide In"
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Just as in the real surface mines..
 the highwall is a constant danger. 
One wrong move can spell disaster.

It looks like the slide started while
 the drag was swinging.

The combination of the weight of 
the machine,  and the momentum  of the swing, carried the drag into the pit.

Now resting at the bottom of the highwall,  it's going to take a lot of work to get back out.