Sydney Trains chaos:  Major delays - with T1, T2, and Blue Mountains lines all impacted

Sydney Trains has warned commuters to expect delays this morning due to urgent signal repairs at Harris Park in Sydney's west. 

Passengers on the T1 North Shore, T2 Cumberland, T7 Olympic Park and Blue Mountains lines should allow extra time for travel.

Services are currently not running on the T5 Cumberland line. 

'Trains are not running on the T5 Cumberland Line due to urgent signal repairs at Harris Park,' Sydney Trains said in an update on X. 

'You will need to catch a train to either Granville or Lidcombe and change there to complete your journey. Please allow plenty of extra travel time.'

Several services are running at a reduced frequency on Monday morning. 

'I caught the very early train today because I had to get to work early. I should be in Kingswood by now but I'm still stuck in Homebush,' one commuter wrote on X.

'It's problematic that on a Monday the only advice is to allow extra time when so many people have to start their working week.'

Sydney Trains said replacement buses had not been requested at this stage.