Girl, 15, allegedly groped on Sydney train

A 15-year-old girl has been allegedly groped by a man at a station and on a train in Sydney's northwest.

The teen was approached by the man while waiting for a train at Windsor station on October 23.

He allegedly touched her inappropriately despite her telling him stop.

The girl then boarded a Blacktown-bound train, but the man allegedly followed her onto the train and continued to touch her.

The 15-year-old got off the train at Quakers Hill station and contacted police, who arrested the 26-year-old man at a home in Ebenezer on Wednesday night.

The man has been charged over the attack and granted strict conditional bail to appear at Windsor Local Court on November 21.