A Sydney commuter who stood up for a Muslim couple that were subjected to a stream of vile abuse on a train said she’d "had enough" and would hope others "would stand up and help defend what is right".

Stacey Eden, 23, was travelling on the Airport Line to her home in Mascot when she witnessed a middle-aged woman berating a Muslim passenger over her hijab and telling her that all Muslims were ISIL supporters.

Ms Eden did not hesitate to jump into the verbal stoush and record it on the woman's behalf, saying "she wears it because she wants to be modest with her body, not because of people like you who are going to sit there and disrespect her".

Today Ms Eden spoke to 2GB radio host Ben Fordham, and said the couple had done nothing to bring on the stream of abuse.

"I just felt so bad for them because they seemed to come across as so intimidated from what the woman was saying they couldn't even say anything for themselves," she said.

Ms Eden said the woman had been abusing the couple for 10 minutes when she decided she "just had enough" and said something.

"She was looking around the carriage as she was saying things, hoping someone would stand up and agree with her but fortunately it didn't work out in her favour because I stood up and told her what she was saying wasn't right," she said.

The belligerent passenger had mentioned last year's Martin Place siege and the recent murder of more than 100 Christians in Kenya at the hands of ISIS.

"That is not her doing it. That is a minority of people. Not a majority of people okay? Ms Eden said.

"It doesn't matter what they're doing... Have some respect, have some respect.

"What's that got to do with this poor lady? What's that got to do with her?"

While the majority of the unknown woman's rant was directed at the Muslim couple Ms Eden said she was not spared any of the abuse after stepping in.

Ms Eden then told the woman to shut her mouth and then stayed on the train with the couple to make sure they were safe.

Stacey Eden, who stood up for a Muslim couple being taunted on a Sydney train. (Supplied) (Supplied)

She said the abusive woman and the couple both got off the train at Sydney International Airport.

Ms Eden said she told the couple as they got off the train "please don't take this as a representation of all of us, because we're not all like that".

Ms Eden has been praised by the Islamophobia Register Australia, which said they were "heartened by Stacey's actions".

"She is a reflection of 'Team Humanity' and we hope that her actions inspire others to stand up against racial or religious vilification," the group said.