These ain't shelves, but they are what I am using to store my trains that don't fit on my meager amount of available shelves. Most of my trains do not have boxes - or the boxes they have are in poor condition from long-term basement mildew/moisture. Anyhow, these storage boxes are used frequently by the trading/gaming card folks. They can be found by searching for "Super Monster Cardboard Trading Card Storage Boxes" and if you search long enough you can usually find them for less than $7~8 each. They are pretty strong and I have them stacked 10~12 high without any problems. They come in different sizes from roughly 14 inches to 18 inches long. The last batch I purchased cost less than $60 for a dozen boxes