Disturbing footage has emerged showing a young woman launch a shocking verbal attack on a commuter sitting alone on a busy Melbourne train.

In the short clip uploaded to social media, a blonde woman shouts racist obscenities across the Metro Trains carriage, urging the victim to 'go back to your own country'.

The situation escalates when the woman appears to ask her tormentor to stop looking at her.

'I'll stare at you the whole time now c***. Make me shut up, b****. I ain't gonna shut up. I never gonna shut up, c***,' the blonde, wearing a black hoodie, responds.

Shocking video has emerged a young woman launching a vile, racist attack on a commuter sitting alone on a busy Melbourne train

'What are you going to do? Go back to your own f***ing country... F**k you too, you motherf***ing curry muncher.'

The victim attempted to calm the situation and said: 'I don't know you, you don't know me.'

'It's my country, it's not your f***ing country,' the blonde woman responds.

The woman who posted the video to social media described the behaviour of the two blonde girls as 'disgusting'.

'They racially abused a lady sitting on her own. [We] pressed the emergency button and sat beside the lady to support her until these girls got off the train.'

The group were praised online for supporting the victim, with one writing: 'Well done ladies, so glad you didn't just stand by.'