just looked up how you can avoid the privately-owned railway section when going to the sydney airport - turns out you can get off at the last publicly owned station and change to bus line 420 at coward street
@elexia@sk@jeder well, in this case it was probably "the railway didn't want to pay for the tunnel or something, so they established a PPP and now the users are paying the bill for the tunnel and station". Not the worst solution to be honest