People who scream 'nationalisation' at everything either appear to know very little history, being ignorant, or choose to be myopic. It is troubling to see folks clutching onto opinions that remain unchanged in light of either more education or new information proving those views wrong. This is conservatism at its worst. Blind adherence to an entrenched position.
With regards to nationalisation of public transport, these people shouting 'nationalisation' should look at examples implemented worldwide and do a comparison between privatised and nationalised systems. There are reasons why nationalisation, communism and other forms of state control don't work for various enterprises and why the mechanisms of the market work for others.