The red Routemaster has become internationally recognised as an icon of London. This bus, RM1, was the first of four prototypes for the Routemaster. It made its first public appearance in 1954 at the Earl's Court Motor Show. Before entering service it underwent extensive testing, included skids at 30mph and a tilt test to at least 28 degrees. In 1956 it was trialled on Route 2 between Golders Green and Crystal Palace. Passengers were encouraged to share their views on this 'future London bus.'