Ah, but it is 'privatised' you see, so as to benefit the shareholders.
Also, if it were really state-owned, rampant fare hikes would exact a heavy political cost on the ruling party.
However, people may tolerate fare hikes better for a 'privatised' company. Shareholders would also be happy with a profit-maximising philosophy, because, really, who gives a damn about the poor folks when you can collect fat dividends on those few lots of shares?