this is not accurate/correct (anymore). there was a point in time when Melbourne was not "the worlds most livable city" and as such we have/had a train network from the 1950s, including the control systems which mostly ran up untill 2009 under connex' tenure post privatisation.

Metro Trains which is a consortium took over the train network at this point and was contractually obligated by the state to upgrade all core and edge technology systems.

I worked at MTM circa 2016/2017 and all the truly legacy operation control systems had been replaced.

there was a heap of funding allocated for fun things like maintaining OCMS/IT systems and updating customer facing/passenger information systems.