So sorry alish00, it was my mistake, I was looking at the wrong item. My bad, sorry for the confusion. I have updated the list. Thanks for pointing it out.
I'm happy to hear it's useful for you. I had a difficult time deciding the quantities I needed to keep for my trains with my barn limit, so I compiled this list back then to solve it. Since then I had been able to send off more trains effectively and yet have decent spare barn space. If you have any good tips, please free to share too.