Many years ago we bought a 40foot container for storage in our orchard. It has provided safe and dry storage with minimal maintenance.
Line containers single file on each side of say two tracks. Since containers are designed to be stacked, a removable roof could be placed on top of the containers,
spanning the tracks. Fill the containers with spare parts, tools, pieces of equipment to store out of the elements; since you can drive a forklift inside them, better
storage than an old boxcar. Raise the whole area on 6" of roadbase to eliminate standing water and you have quick, rugged, and fast temporary covered storage.