168004, which appears to be becoming my most frequently photographed Class 168 unit, passes Fritwell on a gloriously sunny 11 October 2010 with the 1H33 10:52 Birmingham Snow Hill to Marylebone Chiltern Railways service. Right from my earliest days as a railway photographer, I have noticed that certain locos and units will turn up repeatedly for no apparent reason, while others will seem to avoid my camera completely!