WAGR official photo of WJJ 525 (RHWA collection)

WJJ 525 was built for Caltex in 1971. WJJ 531, owned by AMPOL, was built in 1971. 

WAGR official photo of WJJ 531 (RHWA collection)

By 2010 531 was listed as class ATJY but 525 was not listed.