Sydney's train network has again been hit by delays due to "urgent signal repairs" at Homebush, with some trains cancelled. 

Sydney Trains is warning passengers to seek "alternative arrangements", with commuters facing long delays at stations across the city.   

The ABC was told the following services have been impacted:

• T1 Western line
• T1 North Shore line
• T2 inner west and Leppington lines
• T3 Bankstown line
• T5 Cumberland line
• T8 airport and southern lines
• T9 northern lines

Commuters at Central Station were told there would be no western train services running tonight and they should make their way to buses.

Sydney Trains said NRL fans on the way to Olympic Park should also seek alternative arrangements. 

It said shuttle services are being introduced across the network.

It is the latest issue to cause headaches for passengers after the entire network shut down earlier this month when a digital radio system that controllers rely on to stay in contact broke down.

Granville resident Zar Manalo has been trying to get home with his pregnant wife and son. 

He said they had been waiting at the station for more than an hour and a half and was not told about when replacement services would be provided. 

"There are no train replacements," he said. 

"We tried to book an Uber but it's expensive probably because of this situation."

He said public transport was a key issue that he hoped the incoming government would urgently address. 

"This is not the first time. It always happens."

Wyatt Tutton was also trying to get home from Central to Ashfield. 

"I would say it's chaos," he said. 

"It happens all the time. You'd think they'd have it under control a bit better."