66040 is just coming off the branch from Aylesbury into Princes Risborough station as 168 001 rushes through whilst working the 09:55 from Birmingham Moor Street to Marylebone. 66040 is heading 6A58, the 10:14 from Calvert to Northolt empty "Binliner" train, approaching a red signal at the south end of the platform. This turned to yellow as it approached as 168 001 was not hanging about! 11:01, Wednesday 5th October 2011. Digital Image No. GMPI10346.