A man received first aid after sustaining injuries to his hand during a fight on a train at Bracknell Railway Station.
The incident happened at around 6.30pm on Saturday, February 23.
Officers from Thames Valley Police and the British Transport Police attended and a man was arrested on suspicion of GBH.
He remains in custody.
The ordeal left a man with an injury to his hand and had to be given first aid.
An investigation into the incident is ongoing and police are appealing for any witnesses to contact the British Transport Police by calling 0800 40 50 40.
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