Police have withdrawn charges against a man accused of raping a teenage girl in broad daylight at Strathfield train station.

Ben Kooy, 34, was arrested last Wednesday and charged with dragging a 17-year-old girl off a train around 1pm and into a toilet block where he allegedly sexually assaulted her.

Charges dropped: Ben Kooy. Credit:Kate Geraghty

Police were told Mr Kooy struck up a conversation with the girl as she travelled from Redfern station to school.

The Kellyville man was initially refused bail and spent four nights in custody but police found fresh evidence at the weekend and released him ahead of an appearance at Burwood Local Court on Wednesday.