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
Baroque riding stables - EQUUS DESIGN - Das Planungs- und Einrichtungsbüro für Reit- und Gestütsanlagen
Beechwood Stables - Photo Credit: Kenneth M. Wyner
Round pen connected to arena. Great idea plus it looks really nice. The only think I'd change would be that I'd add another gate on the outside of the round pen.
Cades Cove Riding Stables, Townsend, Tennessee
Put a sand/soft path going around the property so you can ride wherever you want without going on the concrete!!
Beechwood Stables - contemporary - garage and shed - boston - by Marcus Gleysteen Architects
Cross Country Fence at Dean Riding Stables http://www.deanridingstables.co.uk/pictures/facilities/facilities4.jpg
Horses at the riding stables, Botlierskop, Game Reserve, South Africa by robin denton, via Flickr
Bourne Hill covered riding arena