Information on a young man who died when he fell from a train in Sydney (? Granville) in 1965 or 1966 ?

Hi - I would like to know the name of this man, as I am told that he is the brother of my father, who I am trying to locate. As this is the only key to my fathers name, this is my only hope in finding him. If you have any information on this man or his family, I would really appreciate it. I was told that he fell from the train at Granville Station in Sydney, or on the line from Granville to the city. If you have any suggestions on where else I could try to track this information, it would be greatly appreciated. Kind regards, Marina