Officers from British Transport Police are looking to trace them after a group manually opened doors on a train to force it to stop.
The incident happened on 19 June at approximately 3.50pm at Ponders End station.
The Greater Anglia service was heading between Enfield Lock and Angel Road, the service was not due to stop at Ponders End. However, a group of men used the emergency door release to open the doors, forcing the train to perform an emergency stop.
They then left the service at Ponders End. The actions of these men caused substantial delays to services whilst the emergency was investigated.
Anyone with information should contact BTP by sending a text to 61016 or by calling 0800 40 50 40 quoting reference 406 of 21/06/2018. Alternatively, ring Crimestoppers anonymously on 0800 555 111.