Based upon a prototypical structure which was once used to house and repair locomotives the new structure is a styrene plastic kit molded in appropriate colors so paint is not required. The sturdy construction features brick detail opening doors stalls spaced at 15 degrees an office which can be positioned in multiple locations two different styles of ventilators and modular construction. The basic 3-stall kit can be expanded by adding more units to create a bigger facility. Assembles easily using plastic compatible glue. This item is designed for use with the Atlas N Manual Turntable (Item # 2790) which can be powered by the Atlas Turntable N Motor Drive Unit (Item #2791) both of which are sold separately. Dimensions Longest section-10 3/8" Widest section- 11" Highest section-3" Stall size maximum 8" locomotive over couplers Motorizes N turntable Used to motorize the N scale turntable.