What Happened to Hovertrains? (2018)

Without the rolling resistance of train wheels, hovertrains promised greater efficiency and much higher speeds. By feeding high pressure air through lifting pads, hovertrains float on a cushion of air much like a hovercraft. British research led to the development of the RTV-31 Tracked Hovercraft, and the American’s developed several prototypes, culminating in the development of the Urban Tracked Air Cushion Vehicle (UTACV).

Source: www.youtube.com