At many arenas, the rails are put to different uses in daily operations. To ensure that the distance to the storage facilities is not too far and to minimise the time required for fetching use a Rail Storage system via Schlosser
I appreciate the small pens, as an addition to large pastures, of course. Maybe you need to keep a horse in while you wait on the vet or a buyer. You can stash him there without typing up an easily agitated horse.