Parramatta Centric Revisualisation: Geographical Accuracy

Key features of the Parramatta Centric revisualisation of Sydney's rail network are the middle and outer orbitals centred on Parramatta.  These orbitals were diagrammatically shown as ellipses.  However, as seen in the map below, this is surprisingly accurate geographically, as key railway stations and centres are located very close to a "best fit" ellipses drawn through them.  The long axis of these ellipses is restrained to perfect east-west by my drawing program, and it may be that the fit would be even better if there was a slight rotation to the ellipses.  Either way the fit is very good: