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