Victoria regional train services suspended due to radio network fault

All regional train services in Victoria have been suspended due to what service operator V/Line has called a "radio network fault" thought to be related to the Telstra outage.

Services on the Bendigo, Seymour, Gippsland, Geelong and Ballarat lines were suspended on Wednesday morning.

V/Line said it was "assessing the situation and will advise when trains will resume".

The operator said there was "no estimated time for rectification at this stage".

Replacement coaches are operating from Southern Cross Station, but V/Line said space on the coaches was "very limited".

"Passengers are advised to defer travel where possible," a spokesperson said.

It is not yet clear whether the communication fault is linked to the nationwide Telstra outage.

Train passenger Simone said she was stuck on a train at Ballan, north-west of Melbourne.

"The V/Line staff don't know about any [replacement] coaches or anything," she told ABC Radio Melbourne.

"We've been told Ballan doesn't have any Ubers, taxis or anything like that, so we're just stuck here until we get more information."

Gippsland resident Wendy Farmer was up early to catch the 5:59am train from Moe to Melbourne for a conference but was now stuck at Warragul Station.

"We can get off the train and just wait outside on the station, but it's pretty cold out there at the moment."

Ms Farmer said V/Line staff have advised commuters that if they could make their way to Pakenham somehow, then they could continue into the city on the metro train network.

"I'm not sure how we're going to get there, it's a long walk!"

"I just feel like saying, 'Hey guys, I'm on Optus, you can borrow my phone for communication if you like.'"