DRS Class 20s Nos. 20308 and 20312 had arrived at Princes Risborough station at 07:51 for a pathing stop to allow a fast Chiltern service to overtake. 168 219 having passed them, they start away at the head of 1Z20, Pathfinder's "Buffer Puffer" tour, initial leg 05:05 from Crewe to Liverpool Street. Due to depart at 08:03, they are running a couple of minutes early at 08:01 on Saturday 26th Janury 2013. Digital Image No. GMPI13812.