By reading the description for tender 11950.110 (School Students Special Needs Transport Scheme), TAMS may be contracting SNT services away from ACTION.
The tender details can be found at http://www.procurement.act.gov.au/tenders_advertised/tender_download/open_tenders/11950.110 (http://www.procurement.act.gov.au/tenders_advertised/tender_download/open_tenders/11950.110)
It wouldn't be the first time.. Kiers were providing it for a while