The younger brother has won the Olympic gold medal in the super heavyweight division in Atlanta in 1996.
Harrison won super heavyweight gold at the Sydney Games and was tipped to become a world champion in the professional ranks.
The boxer lost the 1988 Seoul Olympic super heavyweight final to Lennox Lewis, but in 1992 he became the undisputed heavyweight champion of the world after beating Evander Holyfield.
British boxers surpassed their Beijing target with bronze medals for light-heavyweight Tony Jeffries and super-heavyweight David Price, and a superb gold for middleweight James DeGale.
The train was already busy with boxing fans heading home after watching super-heavyweight boxer Anthony Joshua win his first round fight for Team GB.
BBC: Fencing gold medal winner Limardo takes public transport
Harrison won gold in the super-heavyweight division at the Sydney Olympics, but four defeats in eight fights left his career in the balance before Prizefighter offered him a route back.
Mantek was pleased with the results when he used the Reiss system at the 2008 Beijing Games, where Steiner, a 29-year-old, 320-pound super-heavyweight, won Olympic gold after taking silver at the European championships.
Without it, we don't have young Jeff Blatnick of Niskayuna, New York, growing up to beat cancer and beat his opponent in the 1984 super-heavyweight gold-medal match, quite a feat for a kid who had his spleen and appendix taken out.
Lets get things straight I'm a big light-heavyweight and he's a super-middleweight, I think he's seen sense.
The 26-year-old previously held the European super-middleweight title but stepped up a division to claim the fringe WBO intercontinental light-heavyweight title against Sergey Demchenko last August.
Calzaghe, unbeaten in 45 bouts, was king of the super-middleweight division - holding the WBC, WBA and WBO titles - but The Ring light-heavyweight crown he won by beating Hopkins was to be on the line against four-weight world champion Jones.
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