Now what chance this happenning 50 years on from when class 31s first appeared? Probably the two oldest
main line approved diesels on the same train in the year 2006...not only that but consecutively numbered
and both earlier 'skinhead' members of the Class . 31106 leads the Serco Test Train with 31105 on the back 
through Putney on the 24th April 2006. 
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Photo from James & Martin's Picture Collection Copyright 'Jampics' m.hawkes7@ntlworld.com 
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British and Foreign Railway Pictures <A HREF="http://jampics.fotopic.net/"> Jampics Fotopic.</a>