With great difficulty, much planning, and a couple of heavy cranes. Maybe even dismantling some of the overhead framework.
That wreck is the result of some dopey operator forgetting to lower his hoist.
They usually string a heavy cable with big empty drums attached, 100yds in front of any overhead obstructions, so the half-asleep operator gets woken up with a helluva lot of banging noises .. which immediately means the brakes very promptly get applied before damage can be caused.
Of course .. there are just plain bad days .. when the wheels and other bits just fall right off ...
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