UPDATE 11:45am: Trains are running again, but the the 11:50am Campbelltown to Moss Vale service is cancelled.
The next service is 12:53pm.
No trains are running on the Southern Highlands Line in both directions between Campbelltown and Moss Vale due to a train communications issue.
Replacement buses are being organised but are not yet on site.
Passengers are being asked to allow plenty of extra travel time, delay their journey or consider alternative travel options.
IMAGE CREDIT: Tomiĉo, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons