The History of Australian Roadtrains — From Bertha to B-Triple

Welcome to Big Truck Time! 🚛 In 1945 a bush mechanic from the Northern Territory bolted two home-built trailers onto a surplus American army tank carrier and created something Australia had never seen before. In 2007 a B-triple was approved for Australian roads — a combination carrying the load of five semi-trailers, stretching 53.5 metres and weighing 180 tonnes. Between those two moments — 62 years of Australian ingenuity, government regulation, pioneer operators and engineering evolution. This is how the Australian road train became the most productive freight vehicle on earth. Kurt Johannsen started with a Diamond T980 — a surplus WWII tank transporter stripped of its armour and rebuilt for the outback. The real breakthrough was the trailers. Johannsen salvaged Bren gun carrier chassis, cut away the tracks and engineered a dual wheel set assembly mounted on pivoting turntables. Through a series of mechanical linkages each trailer's axle responded to the movement of the one ahead — causing it to steer automatically into the tractor's path. The self-tracking system allowed the entire combination to snake through tight bends and follow the prime mover's exact line, reducing tyre drag and the risk of bogging on soft ground. Every component chosen for field repair. Simple enough to fix with hand tools and scrap steel. 1948 — the first commercial haul. Bertha, hitched to three self-tracking trailers, moved 74 head of cattle from the Barkly Tableland to Alice Springs across hundreds of kilometres of rough unsealed track. Where the railway ended and the dirt began, Bertha proved its worth. Bertha now stands on permanent display at the National Road Transport Hall of Fame in Alice Springs. By the early 1950s British trucks — Thornycroft, AEC, Leyland and Foden — dominated the outback. Their engines delivered between 150 and 250 horsepower. Radiators designed for English weather faltered in 45-degree Northern Territory heat. Overheating was routine. Then the Americans arrived. Mack and Kenworth brought engines rated at 300 to 400 horsepower, double the torque and cooling systems built for the desert. A Mack B Model could pull longer combinations without boiling over. The shift from British to American rigs set a new baseline for everything that followed. 1960 — Noel Buntine founded Buntine Roadways in Katherine. Starting with a handful of Bedfords and Fords and a single depot, by the end of the decade the operation had stretched from the Top End to Queensland cattle country. Five depots. Katherine, Alice Springs, Wyndham, Tennant Creek and Mount Isa. More than 50 road trains by the 1970s. By 1980 Buntine Roadways was the largest road train operator in the Southern Hemisphere — proof that road trains could operate as a system, not just an outback experiment. 1987 — the B-double changed everything. Bob Pearson, an engineer with the Country Roads Board, had studied Canada's B-train in 1981 and returned convinced the fifth-wheel coupling system could transform Australian freight. Early trials showed a 20 to 30 percent reduction in fuel use per tonne-kilometre and a smoother ride with less sway. Government approval in 1987 set the legal foundation for B-doubles nationwide — initially 23 metres, carrying up to 87 tonnes. 2007 — the B-triple approved. 53.5 metres. 115.5 tonnes. A further 10 to 15 percent payload gain over the B-double. AB-Quad and BAB-Quad combinations pushing gross masses to 135 tonnes on select high-productivity corridors. Modern prime movers from Kenworth, Mack, Volvo, Scania, MAN and Mercedes-Benz rated between 600 and 800 horsepower. Every vehicle over 18 metres displaying yellow-on-black Road Train boards as required by the National Heavy Vehicle Regulator. From Bertha on a dirt track in 1945 to a 53-metre B-triple on a sealed highway in 2024. The same idea. Completely different execution. In a country where distance still defines commerce — ingenuity drives every kilometre. 🚛 Subscribe for more Australian trucking history If you love trucks, roadtrains, roaring engines, and everything that keeps the highways alive — you’re in the right place. From powerful machines hauling massive loads to the raw beauty of diesel engines at work, this channel is all about the heart and soul of trucking. 👉 Hit that Subscribe button so you never miss the latest videos from the world of big rigs and road power! 📨 For business inquiries or collaborations, feel free to contact me at: [email protected] #trucks #trucking #truckdrivers #truckers #roadtrains #roadtrainsaustralia #australia #outback