The man police wanted to speak to about an incident of indecency on a train went into a police station voluntarily after an appeal in the Daily Echo.
The 40-year-old man from New Milton was interviewed by officers under caution.
British Transport Police say he will be assisting officers with their enquiries into the incident.
Officers appealed for the public’s help by releasing CCTV images from a train from New Milton to Bournemouth.
A man sat opposite a 17-year-old and looked at the victim before touching himself indecently.
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