Picture 1 shows how I keep freight cars in plastic drawers. Each drawer contains tanker cars or box cars etc. So it’s easy to find what I want. Also on the left passenger cars are stored in separate plastic containers that hold 5 18” cars perfectly. All are kept dust free and easy to get to.
Picture 2 is where my engines, doodlebugs and subway etc go. It will be covered on the top, sides and back in plastic sheeting. It’s not 100% dust free but not terrible with dust either.