The baby of the family, Abt 5, was built by the North British Locomotive Co. in 1938, 5 years after road access was established between Queenstown and Hobart and 42 years after Abt 1 was built!
For many years after retirement in 1963, from the Mount Lyell Mine and Railway Co, Abt 5 was housed at the Puffing Billy Museum between 1963 and 2006, whereupon she re-entered service back on the West Coast.
Being built in 1938 makes her 30 years younger than her next sibling, but only 15 years older than the diesel engines, making her closer in age to them than the other steam engines!
Abt 5 admirably held the fort as the only steam locomotive in service after the COVID pandemic in 2020. Regulatory boiler maintenance in 2022 uncovered extensive repair work required for her to return to regular service, for which additional funding is required.