 The tramway was closed between 1950 and 1956 , after which the operation became the Edinburgh Corporation Transport Department . In 1965 , it purchased its first rear @-@ engined double @-@ decker bus , <unk> , a Leyland Atlantean <unk> / 1 , which is currently preserved at the Scottish Vintage Bus Museum in Fife . Almost 600 buses were added to the fleet over the next 17 years . 
