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General Roy Stone's Centennial Monorail was demonstrated at the Centennial International Exhibition of 1876, the first official World's Fair in the U.S., which was held in Philadelphia (Pennsylvania) to celebrate the 100th anniversary of the Declaration of Independence.
The track was approx 155 m (170 yards) long and joined the Horticultural Hall and the Agricultural Hall in Fairmount Park. It was used by one elaborately decorated double-decker railcar in Victorian art deco style. It had two load-bearing double-flange wheels, of which one was driven by a rotary steam engine of the "La France" type.
The concept was similar to that of the Lartigue Monorail: The load-bearing rail was installed on top of wooden A-frames. 1,346 mm (4 feet 5-inch) below there were two guide-rails for balancing the vehicle. The load-bearing wheels had a diameter of 711 mm (28-inch). The boiler was similar to that of conventional steam engines: it was 6,400 mm (21 feet) long with a diameter of 863 mm (34 inch). The driver's cabin was at the rear end, and just below there were two water tanks with coal heaped behind them.
- "General LeRoy Stone's Centennial Monorail". The Museum of Retro Technology. Archived from the original on May 20, 2011. Retrieved June 28, 2015.
- Khammas, Achmed A. W. "Buch der Synergie. Teil C. Andere elektrische Fahrzeuge. Einschienenbahnen (Monorail) (I)" (in German).
- Mark Reinsberg. General Stone's Elevated Railroad: Portrait of an Inventor, The Western Pennsylvania Historical Magazine, 1966, Vol. 49, No. 3.
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