A signalling malfunction across Sydney train networks have triggered mass delays during the evening peak hour.

Commuters heading home on Thursday were warned services to and from the city’s west would remain stranded at Central Station ‘until urgent repairs are carried out’.

‘Trains are currently at stand and unable to pass through Granville due to urgent signal repairs,’ Transport New South Wales said in a statement to the Daily Telegraph.

‘Technicians are currently en route to the affected area in attempt to rectify the issue

‘Please delay non-essential travel and use alternative transport to complete your journey.’

Dozens of services on the Blue Mountains, Cumberland and Western Lines have been affected by the issue. 

Sydney Trains issued an travel alert on X around 5pm informing customers of the delays. 

‘Allow extra travel time due to urgent signal repairs at Granville,’ the notice read. 

A signalling malfunction across Sydney train networks have triggered mass delays during the evening peak hour (pictured stock image of commuters at Central Station in Sydney)

‘Trains will stop at or between stations around the affect area. Stops may also change at short notice for some trains.’

Staff from Sydney Train are understood to have advised commuters the trains on the Western lines would be ‘crippled’ if services automatically resumed.

Passengers took to social media to express their frustration at the peak hour delays. 

‘Urgent train repair this morning, peak hours and now another one just as we roll into [the] evening peak,’ one person wrote. 

Daily Mail Australia has contacted Transport for NSW for further comment.  

More to come. 

Dozens of services on the Blue Mountains, Cumberland and Western Lines have been affected by the issue (pictured commuters during train delays at Sydney’s Town Hall station)