The six men are said to have stripped off and defecated in a train carriage before throwing the excrement at each other. Some of the poop grenades went astray and struck a female passenger who was not involved in the faecal fracas.
The group, aged 21 to 27, are also accused of loudly discussing their sexual exploits and asking passengers to expose themselves.
They all face one charge of doing an act of outraging public decency while travelling between Bath Spa station in Somerset and Chippenham, Wilts on July 11, 2018.
The group appeared at Swindon Crown Court today.
The charges allege that the group were loudly discussing their sexual exploits within hearing of passengers.
They are also accused of using abusive language towards passengers, including requests for passengers to expose themselves.
They are also charged with removing items of their own clothing.
Toby Clarke, 22, of Whaddon, Wilts., and Bobby Clifford,…