world’s largest steam traction engine, famously known as “Big Lizzie.” Built in 1917, this colossal machine stands as a remarkable achievement of early 20th-century engineering and a symbol of Australia’s pioneering industrial history.

Designed to haul extremely heavy loads, Big Lizzie weighs more than 45 tons and features massive rear wheels over 7 feet wide, engineered to prevent sinking into soft ground. The steam-powered engine was originally used to transport heavy equipment and materials across rural Australia, including attempts to haul large loads over long distances—an extraordinary task for its time.

Although Big Lizzie faced mechanical challenges during its working life, its sheer size and ambition earned it legendary status. Today, the fully restored steam traction engine is preserved as a historical monument, allowing visitors to witness the scale and craftsmanship of early industrial machinery up close.

Engineering historians regard Big Lizzie as a milestone in heavy transport design. “It represents the peak of steam traction engineering,” said a heritage expert. “No other traction engine in the world was built on this scale.”