there have been several minor incidents. in october 1994, there were teething problems relating to the start of operations. the first preview train, carrying 400 members of the press and media, was delayed for two hours by technical issues. on 29 may 2002 a set was accidentally routed towards victoria instead of london waterloo, causing it to arrive 25 minutes late. the signalling error that led to the incorrect routeing was stated to have caused "no risk" as a result.