Every American steel mill I've been in or heard about has cages that people have to stay inside if they are near the part of the line where this can happen. (Presumably an OSHA requirement, but I'm not 100% on that.)
Not the one I worked in back in the early 90's. You could walk along to rolling line and had to hit a pause button to stop the feeding of billets in the reheat furnace to cross the line to the other side of the plant. Nucor Plymouth.
I was a Nucor engineer in the early 2010s, and all their rolling mills had them by then. Things had changed a lot since the '90s, though. The old guys talked about having to manually replace the electrodes in the arc furnaces, which has been done with a robot arm since the late '90s or early 2000s.
(For those of you who don't know what this is, each electrode is a graphite column one or two feet in diameter and about 20 feet long. Replacing them took two guys, selected for their resemblance to linebackers, and had to be done multiple times each day.)
They now have a walkway to be able to cross over safely. Cobbles sure still happen and it's scary to see hot steel spaghetti fly into the air from within the pulpit.
