Horizon / Princess Beverly Coal on mines in Appalachia. At one stage, 17 D575A's were in service in the West Virginia Coal Fields. In Australia, machines were used in surface mines and on some major road projects across the country. The majority of the machines sold within Australia were Super Ripper. Alcoa, located in Western Australia purchased 5 machines and used them to rip large areas where they couldn't blast due to the proximity to residential housing and they were often operated by Remote Control. 8 machines were sold within Japan working in quarries with many being owned by Fujisaco Co. LTD. Two second hand D575A-2SD machines (ex Australia) were sold to Kaipara Limited (New Zealand) and with the help of Komatsu Australia, had rippers retrofitted to the machines. The machines were operated out of Stockton coal mine in the West Coast region of New Zealand's South Island. These machines were used to rip above areas where abandoned mine shafts existed and were also often operated via Remote Control. Models D555A (Prototype) The D555A prototype was first shown to the public in 1981 at the Conexpo equipment exhibition in Houston, TX. Due to economic conditions at the time, development was stalled for much of the 1980s. A successor to the D555A, the D575A-2 SR Super Ripper began field testing in 1989 and was the first model to enter production beginning in 1991. D575A-2 SR Super Ripper dozer/ripper (Discontinued) The D575A-2 SR Super Ripper was the first production version of the D575A, going into production beginning in 1991. It produced 1,050hp (784kw). The D575A-2 SR Super Ripper included a single shank ripper capable of digging to a maximum depth of . The D575A-2 SR Super Ripper was superseded by the D575A-3. D575A-2 SD Super Dozer dedicated dozer (Discontinued) The D575A-2 SD Super Dozer was the second version of the D575A, going into production alongside the D575A-2 SR Super Ripper beginning in 1995. The D575A-2 SD Super Dozer is an , dedicated dozer with no ripper. The D575A-2 SD Super Dozer was superseded by the D575A-3 SD Super Dozer. D575A-3 SR dozer/ripper (Discontinued) The D575A-3 is an dozer/ripper weighing and capable of moving up to of material per pass. The single shank ripper has a maximum digging depth of . D575A-3 SD Super Dozer dedicated dozer (Discontinued) Introduced in 2001 as the successor to the D575A-2 SD Super Dozer, the D575A-3 SD