The Walthers Cornerstone 3-Stall Modern Roundhouse will be a hallmark of later steam-era railroading on your layout. These add-on stalls allow you to expand your Modern Roundhouse with additional stalls. Roundhouse size was based on the number of engines coming and going in any 24-hour period, with the busiest terminals requiring full-circle roundhouses, so these extra stalls will allow you to match your roundhouse to your layout′s needs. This detailed Modern Roundhouse 3 Add-On Stalls kit includes three stalls on 10-degree centers to make the most of your available space like the prototype. Side walls are included in the Modern Roundhouse kit 933-3260, sold separately. For more realism, interior and exterior brick wall details, fine windows, floor inspection pits and much more are all standard. Check out the variety of Cornerstone N Scale railroad and maintenance structures. Extra stalls for the Modern Roundhouse 933-3260 Authentic North American prototype Kit includes no side walls - those are included with the Modern Roundhouse 933-3260, sold separately Holds engines up to 125 scale feet long Modular design - easily expanded to a full circle Compact 10-degree stall spacing Interior and exterior brick detail Fine window details Floor inspection pits Decal signs included See the Roundhouse Kit here. Read a review of our N Scale Modern 130′ Turntable and Roundhouse in N Scale Railroading Magazine here! (Article courtesy of N Scale Railroading Magazine) For more information on N Scale Railroading Magazine, click here .