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Black Diamond Society of Model Engineers Model Railroad Club in Bethlehem Pennsylvania BDSME Home Page The first floor 650 square foot layout features models of O On30 and S scale steam trains from the glory days of railroading to the mighty diesel locomotives of today including prototype sights and sounds. Operating semaphores and signals further enhance the display. Visitors can even operate specific accessories. The second floor 800 square foot HO scale display has a multitude of trains in operation including some trains stretching to more than 100 cars powered by multiple locomotives winding through mountain scenery.