General secretary of the train driver's union Aslef said although they feel sorry for Ronnie Biggs' family, "We have always regarded Biggs as a nonentity, and a criminal, who took part in a violent robbery which resulted in the death of a train driver".
Mick Whelan said, "Jack Mills, who was 57 at the time of the robbery, never properly recovered from the injuries he suffered after being savagely coshed by the gang of which Biggs was a member that night."
Mr Mills died a few years after the Great Train Robbery took place.
The Great Train Robber Ronnie Biggs who won worldwide infamy for spending 36 years on the run after escaping prison, has died aged 84.
About one month after the robbery, Biggs and other members of the gang were tracked down by police.