A 70-year-old woman has been issued an infringement notice following investigations into alleged anti-Muslim abuse on a Sydney train in March.

Police said the woman from Lisarow on the New South Wales Central Coast was spoken to and issued a rail infringement notice for “behaving in an offensive manner in or on public passenger vehicle/train”.

The incident took place on April 15 when the woman allegedly verbally abused Hafeez Ahmed Bhatti and Khalida Hafeez as they were on a train to Sydney Airport from Central Railway Station.

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A witness, who attempted to intervene, filmed the incident on her mobile phone and uploaded it to social media where it went viral with more than 100,000 views.

The short video was recorded by 23-year-old Stacey Eden, who said she defended the couple during the incident.

In the video, Ms Eden can be heard telling the older woman to leave the other woman’s dress alone.

“She wears it for herself, OK,” she said in the video.

“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.”

The older woman can be heard mentioning beheadings, the Sydney siege and suggesting the woman was an “ISIS supporter”.

Police viewed the video and officers from the Police Transport Command began inquiries which resulted in the issuing of the infringement notice.