The longest slot car track measured 2.953 miles (4.752 kilometres) and was built by James May (UK) and 300 volunteers at Brooklands, UK, on 16 August 2009 as part of the BBC series James May's Toy Stories made by Plum Pictures.
The record attempt was organized as part of the BBC television series James May's Toy Stories, a series of programmes celebrating classic children's toys hosted by popular motoring and modern culture presenter James May. The slot car tack, which was supplied by Scalextric, followed the route of the old Brooklands racetrack in Weybridge, Surrey, UK, which opened in 1907, and was the world's first purpose-built motorsport venue. The circuit hosted its last race in 1939, and was also one of Britain's first airfields (see brooklands.org.uk). Two slot cars raced around the track, which crossed a river, a pond, ran through industrial and housing estates as well as following the remaining parts of the disused Brooklands circuit, with the winner completing the circuit in a little over two and a half hours (organizers had expected it to take a maximum of 30 minutes).
Comments below may relate to previous holders of this record.