Centennial Monorail

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.

It had two load-bearing double-flange wheels, of which one was driven by a rotary steam engine of the "La France" type.

[2] The concept was similar to that of the Lartigue Monorail: The load-bearing rail was installed on top of wooden A-frames.

[1] The driver's cabin was at the rear end, and just below there were two water tanks with coal heaped behind them.

[3] A modified version of this demonstrator was exploited in 1878 on the Bradford & Foster Brook Railway in Pennsylvania.