Addis's Single Rail Tramway

The Addis's Single Rail Tramway was a patented monorail system invented in 1869 by William Judson Addis. == History == William Judson Addis from Thane (previously Tanna) in India invented, patented and developed a tramway with a single rail, on which a bullock cart ran with two double flanged wheels, which could take all, or nearly all, the weight, and two ordinary stabilising wheels, which served to prevent over-turning.

Source: Wikipedia — Addis's Single Rail Tramway (CC BY-SA 4.0)