The 422 class, purchased by QR National/Interail from Northern Rivers Railroad, were originally built in 1969 for SRA (and then Freightcorp) by Clyde Engineering at Granville. The locos are of a full body dual cab design and have use the EMD16-645E power plant (which effectively makes them an updated version of the 421s). The 422s have operated across Australia after a number were purchased by Australian Southern Railroad (ASR) in the period 2000-2005. Refurbished and renumbered to the 22 class, most notably were 2201-2204 which were used on the construction of the Alice Springs to Darwin line. In 2006, QRNational owns 18 members of the class, including 42202 and 42206 (ex-Interail); along with the 16 members of the 22 class (some renumbered, some are not).