British Transport Police are today releasing CCTV images after two men were witnessed fighting on board a train from Paddington to Swansea.
The incident happened at 8.50pm on Monday 2 December. The train was a 6.45pm service.
The men began fighting in carriage G in front of families and children.
Anyone who recognises them is asked to contact BTP by texting 61016 or by calling 0800 40 50 40.
In both cases, quote reference number 102 of 02/12/19.
Alternatively, call Crimestoppers anonymously on 0800 555 111.