It's not all out privatisation. Just like with WCR, the private operator
would be contracted to operate the service as dictated by the government.
The government collects all ticket revenue and then pays the contractor
for operating the service. If, as with WCR, the payment is per passenger,
it is in the interest of the operator to increase patronage, and thus
revenue. Remember that the majority of suburban buses have been privately
operated for a long time, but the ticket prices are dictated by the
government.
Cheers
David