86501 is an unique locomotive having been re-geared to enable it to haul these trains single-handed.
Normally a pair of class 86s are required. It is not clear quite how successful this has been but it is 
still around and regularly appears at Stratford. The date is the 25th September 2003.
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Photo from James & Martin's Picture Collection Copyright 'Jampics' m.hawkes7@ntlworld.com