In December 1955, with an increase in patronage and the availability of purpose-built ACS articulated saloon and buffet carriages, the Tasman began being drawn by X class locomotives, often with a headboard for the service.
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With the introduction of the X class in 1950, Tasmania became the first state in Australia to operate mainline diesel locomotives, and the creation of an intercity express such as the Tasman was further established by the modernisation of the system and infrastructure, such as the redevelopment of Hobart's railway station in 1951.
No members of the class were named after entering service, however X16 was named Festival of Britain in 1951 after it was displayed at the aforementioned exhibition.
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