Minister for Transport Leo Varadkar says industrial relations at public transport companies are like "what you would have seen 30 or 40 years ago".
Drivers at Dublin Bus have refused to accept cost-saving measures, but an independent report published earlier this week said no future third-party intervention would resolve the issue.
Minister Varadkar also repeated
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"Industrial relations in the CIE companies are difficult," he said.
"They are more reminiscent of what you would have seen 30 or 40 years ago than what happens in most modern companies or modern semi-states.
"The real key thing that we all want now is to ensure that Dublin Bus can continue.
"The proposals that are now made are being put to the drivers, and there really is nowhere else to go."