One example of this was AB 792, one of the ten WAB class conversions from 1947–57. Shopped for an 'A' grade overhaul at Hillside Workshops, the locomotive had a cracked mainframe but was otherwise in mechanically good condition. It was decided to use part of the good-condition frames from under AB 661, then recently withdrawn, to replace the damaged section from 792. The locomotive's frame was then altered by cutting the affected section out and fitting the new frame section, ex-661.