DID YOU KNOW
The bus featured in the films was specially built using components from a genuine London Transport Routemaster bus a red, double-decker model first introduced in 1956 that remained in service for almost fifty years. As the Knight Bus is a triple-decker, John Richardsons special effects department cut the top off the Routemaster, added an additional level, put the top deck back on, and had it repainted purple. A second Knight Bus was Constructed for stunt work using another rebuilt Routemaster. This double was fitted onto the chassis of a commercial coach that had an engine powerful enough to pull two tons of added lead weight necessary to counterbalance the extra height so that it didnt tip over when going around corners.