NZR converted three locomotives - 911, 917, and 921 - in 1967 for use as stationary boilers at Hutt Workshops. They continued in this use until 1988 when the boiler house was removed and the hulks were auctioned off. Ian Welch of the Mainline Steam Heritage Trust purchased K 911, the most complete of the hulks, while Steam Incorporated purchased K 917, paired with the tender from K 928, as a potential spare boiler for KA 945. No buyer was found for K 921, which had been paired with the tender from KA 939, and it was later scrapped although the tender and inner firebox, and other parts, including driving wheels, were acquired by Steam Incorporated.