Wales and Ospreys centre Gavin Henson has been charged with disorderly conduct by British Transport Police over allegations of drunken antics on a London to Cardiff train.
Henson, 25, is to be summned in connection with a train journey on December 2.
Three friends who were with Henson at the time of the alleged incident between London and Cardiff are also being summoned and all four will appear at Cardiff Magistrates' Court next month.
A statement from the British Transport Police (BTP) confirmed the names and ages of the four men involved.
"Four men are to be prosecuted for public order offences following a disturbance on the 19.37 First Great Western London Paddington to Cardiff train on the evening of Sunday December 2," read the statement.
"At 9.25pm on December 2, BTP officers at Cardiff Central responded to a call to a group of men causing a disturbance on the train.''
It named the four men as Henson, from St. Brides Major, Jamie Mark Griffiths, 26, from Bridgend, David Norman, 33, from Bridgend, and Matthew Rhys Williams, 25, from Wick.
All four are being summoned to Cardiff Magistrates' Court for offences contrary to Section 5 of the Public Order Act 1986.
A BTP spokesman said the legal representatives of all four men were informed of the decision to prosecute on Monday.
He added that a date for a first court appearance for all four should be confirmed later on Monday.