DRS Class 20s Nos. 20308 and 20312 have arrived at Princes Risborough station for a pathing stop to allow a fast Chiltern service to overtake. They are at the head of 1Z20, Pathfinder's "Buffer Puffer" tour, initial leg 05:05 from Crewe to Liverpool Street. Due to arrive at 07:54 they are running a few minutes early at 07:51 on Saturday 26th Janury 2013. Digital Image No. GMPI13801.