Mr Zitouni has worked for LNER for more than 20 years.
David Horne, LNER managing director, said last week: “In a moment of crisis, Sam did not hesitate as he stepped forward to protect those around him.”
It is thought Mr Zitouni “blocked” the suspect from stabbing a girl, leaving him with a gash on his head and neck.
In a statement from the family shared on the crowdfunding page on Thursday, his wife wrote: “Sam acted as a shield to protect the lives of others, risking not being able to return home to his beloved son.
“This is who Sam is — he would do the same for anyone, regardless of colour, age, gender, religion, or origin, even for those he does not know.
“Sam is our hero.”
Passengers on board the train said a person brandishing a knife began stabbing people after it passed through Peterborough.
The driver brought the train to an emergency halt at Huntingdon in Cambridgeshire.
Anthony Williams, 32, of no fixed address, was charged with 10 counts of attempted murder relating to the train stabbings and a count of attempted murder in connection with an alleged attack in London.
He is due to appear at Cambridge Crown Court on 1 December.