In July 1965, Commonwealth Railways placed an order with Commonwealth Engineering, Granville for eight 22.92-metre (75 ft 2 in) air-conditioned stainless steel sleeping carriages and one dining carriage for use on the Trans Australian. The first was delivered in July 1966. Of these 60 were jointly owned by the New South Wales Government Railways, Commonwealth Railways and the Western Australian Government Railways for the Indian Pacific and the balance by the Commonwealth Railways for the Trans-Australian. In practice they were used interchangeably.