Biggest Bus In Australia -- This Is The Biggest Bus In Australia. Built in Melbourne for use on the Mornington Peninsula, starting from Frankston, it will hold 120 passengers and weighs 90 tons. by replacing five buses now running, it will save tyres, petrol and manpower. Designed on arsterity lines, the bus has seats of wood and tubular steel. It took more than five moths to build, and today officers of the Transport Board, who have advised on its construction, gave it their final approval after inspection. March 26, 1949. Other buses-not quite so big as this-will be built for transporting munition workers. March 26, 1949.