Posted by Rich Brown on August 12, 2016 
Overhead electric catenary ? For what purpose ?
Posted by Chip Allen on August 13, 2016 
No, fall protection, for protecting employees working on top of cars from falling.
Posted by T.Mitchell on August 13, 2016 
That's actually part of a fall protection system. Workers on top of the cars who open the loading hatches wear a climbing harness that's attached to the cable. That way, if they were to slip and fall off the side of the car, the harness and cable will stop them from hitting the ground.
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