stacey eden , 23 , stands up for muslim woman being bullied on the train .
video shows a middle-aged woman ranting about islam to quiet passenger .
ms eden said the ranter labelled the muslim commuters isis terrorists .
she also brought up beheadings , a massacre and the martin place siege .
` what 's that got to do with this poor woman ? ' ms eden fumed .
` shut your mouth if you 've got nothing to say '
ms eden said she stayed on the train to make sure they were ok .
both parties alighted the train at the airport shortly before 2 pm wednesday .
police contacted daily mail australia encouraging witnesses to come forward .
islamic community leader says incidents are becoming increasingly common .
` i always make sure i have sufficient storage space on my phone to record '