High Quality Content by WIKIPEDIA articles! The Leyland Leopard was a mid-engined single-deck bus and coach chassis built by Leyland between 1959 and 1982. It was popular with bus and coach operators throughout the British Isles. It was developed from the Leyland Tiger Cub, one of the most important changes being the introduction of the larger and more powerful O.600 engine (later-built Leopards were fitted with the 11.1-litre O.680 engine).