Having passed the foot-crossing over the down line just south of Princes Risborough, 66553 is approaching signal ME159 which is showing a green aspect and has the bottom feather illuminated for the train to crossover to the up line and take the branch to Aylesbury. The train is 6M22, the 08:16 from Cricklewood to Calvert loaded "binliner". 12:29, Thursday 22nd December 2011. Digital Image No. GMPI10696.