The three carriages are kitted out with technology to capture the condition of the track (ride quality, track geometry) and routinely travel across the Defined Interstate Rail Network. The AK82 is the train number assigned to this particular run. There is a whole document on the ARTC website that explains the train numbering principles. You can find it here: www.artc.com.au/uploads/RAS-Appendix-B.pdf Section 1.1.8 relates to the AK car operations.