66017 and 66001 had arrived at Princes Risborough a few minutes earlier and stopped in platform 3 with 3J04, the 11:00 RHTT from Marylebone. The train is now going forward onto the stub of the Thame branch, under the control of the shunt signal on ME163 on the far left of the gantry, in order for other trains to pass it. In the meantime, the signal for the centre through road is showing a yellow aspect with the feather for a non-stop northbound train to overtake whilst this manoeuvre was taking place. 12:11, Thursday 6th October 2011. Digital Image No. GMPI10366.