That's been the story in past conversations on this site, that the chair rail added to the rigidity of the walls.
I don't think that piece of angle iron is going to do much in the extreme event of a crash. I've always put them back on if I've removed them temporarily, due to claims about the structural integrity of the shell of the vehicle. The chair rail in this bus is actually welded in so there may be some truth in the structural issue.
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Robin
Nobody's Business
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