So, back to our anonymous guest. Is the 250 lb placarded limit for the 5' shelves or the 10' shelves?
I get that the big bags will likely stay on the ground for handling purposes. No problem whatsoever can I speculate in putting 10 lightweight bags on each 10 ft shelf section.
But to say the shelves won't be used at all? That's sort of ridiculous. Unless there is s safety issue that has nothing to do with capacity.
As I undersand it the weight limit was determined by that soft web material you can see in the photos on the sides of the shelves so the length of the shelves does not matter.
I would agree with you that it seems ridiculous to say the shelves won't be used at all. I think all that were told they would not be used were surprised. It was explained as a safety issue.
When the new baggage cars are in service a month or two it will be clearer how they actually will be loaded. We were told not to use the shelves. But we are used to being told one thing on Monday and something different on Tuesday. So maybe the shelves will eventually be used.
I'd be positively shocked if the web material itself is the problem.
That looks like basic 1" nylon webbing. Flat Climbing webbing has a working strength of 6,000lbs. Let's assume they cheaped out and used something thinner.. and say 3,000lbs. But you've got one at either end. So you're back to 6,000lbs. (This is ignoring all the additional webbing in the "web" which would add strength).
So 6,000lbs, let's assume they're extra conservative and want a 10x safety factor, that's 600lbs per shelf. And that's being fairly conservative.
That said, if it IS the webbing that's easy to resolve.
If it's the fact the force is being transferred to the skin of the car which isn't designed to be structural, that would be harder to solve (but honestly more believable.)
Either way, I'm guessing it's not a showstopper.