This follows after industrial action delayed direct trains in both regions on October 20.

The disruption means the Southern Highlands line will run less and experience alternate stopping patterns.

These changes also impact the Blue Mountains, Central Coast, Newcastle Line, Hunter Line and South Coast Line.

Some Sydney Trains and other intercity lines such will experience these delays.

Read more:

Due to planned industrial action, delays are expected on some Sydney Trains and NSW TrainLink Intercity services. Sydney Metro services are not affected.

Limited buses will run on key routes to support trains.

Transport for NSW advises commuters to plan ahead and consider all travel options before making their trip.

Commuters who need to use the network should allow extra travel time, as services may be delayed and stopping patterns may change.

All regional rail services are running as normal however we do recommend still planning ahead if you have a connecting service, as this may be impacted.

Everyone should check the Trip Planner or a transport app before making their journeys, because trains might be replaced by buses.

We depend on subscription revenue to support our journalism. If you are able, please subscribe here for the Highlands and here for the Tablelands. If you are already a subscriber, thank you for your support.