709Modular constructionOpening doorsTwo different styles of ventilatorsAssembles easily (glue required but not included)Office which can be positioned in multiple locations3 Stalls spaced at 15degAdd more Roundhouse units to create a bigger facility. (Expandable in 3-Stall Sections)HO Roundhouse is designed for use with the Atlas HO Manual Turntable #0305 and the Atlas Turntable Motor Drive Unit #0304 (sold separately)