The fastest slot car was a Scalextric Honda F1 replica, which reached a speed of 983.88 scale mph (1,583.4 scale kph) when it was controlled by Dallas Campbell (UK) of The Gadget Show at the Chatsworth Rally Show, Chatsworth, UK, on 6 June 2008.
"Scale MPH" is the standard measurement for speed records on slot cars. Since the majority of cars are built to a 1/32 scale, their speed is measured over a distance that is 1/32 of a mile (165 feet). In standard speed terms, this car managed an impressive 30.94 MPH - meaning it would be breaking the speed limit in residential areas in the UK!
Comments below may relate to previous holders of this record.