A brawl on a station platform was captured on video and shared on social media.
The British Transport Police has confirmed it is investigating a “large” fight, which happened at Harpenden station at around 3.25am on Saturday morning.
A 21-year-old man was taken to hospital with a broken nose.
Members of the public tried to intervene to stop the violence.
It is believed the incident began on a train.
• Three men, aged 18, 21 and 22, were arrested in connection with the incident. They have been released under investigation while enquiries continue.
Anyone with information should contact BTP by texting 61016 or calling 0800 40 50 40 quoting reference 525 of 26/01/20. Witnesses can call Crimestoppers anonymously on 0800 555 111.
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