Photograph of the back of a freight train. A worker wearing a high visibility vest is standing on a ladder on the rear of the train car next to a sign that says in large red all caps "DO NOT HUMP"
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[–] 12 points 1 day ago

It is apparently because either the car itself or the freight that is loaded on them cannot handle the impacts of shunting and jolting from gravity sorting.

It is kinda fortuitous that I saw this today. I was right at a track a few hours ago and saw 4 fully loaded cars with no engine attached rolling free towards the neighboring train yard. Now I know the two track guys standing next to it were humping.

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