Several bays of the Spencer Shops roundhouse, built in 1924, are devoted to locomotives and rolling stock in the museum collection restored by volunteers. It was here that steam locomotives from 1924-1953 were repaired. In the first 16 stalls, visitors can walk among the massive locomotives and rail cars on display in an open-air setting. Moving into the enclosed Elmer Lam gallery in stalls 17 through 20, aviation exhibits dominate, with a full size replica Wright Flyer, Piedmont Airlines exhibits, and more. Moving into the restoration shop occupying stalls 21 through 32, visitors may also see volunteers working on various railroad pieces, and even manufacturing parts. The remaining five stalls are dedicated to additional enclosed exhibits.