 
Overhead Cranes:
The cranes have stops or bumpers.
These prevent the crane from traveling off the end of the tracks.
There is also a stop to prevent the hook from being raised high enough to run into the trolley

1. |
These stops are not considered an operational control. |
2. |
They are there to prevent accidental damage to the crane |
3. |
They are for emergencies only and are not intended to routinely stop the crane |
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