"All staff are expected to follow the same rules and bylaws as anybody else, and we take a very dim view of this sort of thing," he said.
He could not say what action might be taken against the women, but acknowledged that an infringement notice could not be issued on the basis of a supplied photo.
Only authorised parking officers could do that, based on evidence they could gather at the scene of an offence.
Mr Thomas was confident the women were not parking officers.
The incident follows a backdown by Auckland Transport three weeks ago, in which it rescinded fines issued to the owners of 27 vehicles parked with wheels over the kerbs of two narrow Orakei roads.
A petition raised by the Auckland Ratepayers' Alliance against the fines gained more than 2000 signatures.
Less than a week after the fines were issued in a single overnight blitz, an Auckland Council car was photographed parked illegally across a footpath of one of the two roads, Tautari St.
The next day, Auckland Mayor Len Brown was dobbed in by a Herald reader after his chauffeur-driven car was photographed in early August, parked illegally in a loading zone in Newmarket while he attended what his staff described as a business meeting.
Auckland Transport has in the meantime disclosed 446 incidents recorded on GPS devices in its cars in the eight months to August 31 in which staff were recorded exceeding 110km/h - including one at 126km/h.