Claim: A variety of engines, including ones with twin boilers and more conventional single-boiler, were made for the American monorails Bradford & Foster Brook Railway.
Evidence: The Bradford & Foster Brook Railway was one of the earliest, if not the first, monorails in America. A variety of engines were constructed for the railway. The first engine had twin boilers and sat low on the rail. It wore out quickly, and was replaced by a heavier engine of more conventional single-boiler design.