1st,WELCOME to this Forum Atlas,we're SO GLAD a Major manufacturer is reading our topics here.
I'm enclosing photos which I hope come through well as I'm not too good at this,of schemes for your 4750 & 5161 cvd grain hoppers.
I'm enclosing pic's of Safety Shelf Couplers & ground throw switchstands,also.
I discussed Prototypically operating shelf couplers years ago with Atlas' R&D Dept.,but they said HO was too small to have such a product that now exists very well in HO. o scale has a even greater advantage because of the size than HO & can use cut levers for greater realism and a magnet to activate the 'pin" for those who like the couplers but don't care that much about the extra realism. Anyway,it would be a great product for modelers in any era,modern or earlier eras as the safety shelfs could be supplied as add ons for modern era modelers. No modern safety shelf coupler exists yet,so the manufactuer that "gets out of the gate 1s"t,so to speak,wins the prize.
Also,O scale's size opens up the possibility for a truly prototypicaly operating ground throw switchstand that when the throw handle turns,rotates the target on top of the 'stand,as well as turning the switch points or derail,whichever the case maybe,by means of beveled gears in the 'stand housing. This has never been done in any scale of the smaller scales or in O scale.
so here goes Atlas,I hope you find ideas of interest!
Thank you for looking.
Al Hummel