Sydney's rail workers followed through on union threats of rail action, stopping the first of its train services last night.
There are fears further industrial action could cause chaos for commuters today after services on Sydney's south coast line came to a halt last night.
The RTBU voted to launch industrial strike action over the holiday period.
The Minns government lost a challenge in the federal court yesterday to stop the planned striking, but says it will launch fresh legal action.
Rail workers are seeking a 32 per cent pay rise over four years and a 35 hour working week.
