Having worked up earlier from Birmingham Moor Street to West Ruislip, 37602 and 37603 then did an interim run with test car 977997 departing from West Ruislip at 12:57, still as 2Q08, as far as Princes Risborough. The train is seen crossing from the down line to enter the up platform, where reversal took place again to work back to West Ruislip. Just about the worst possible time of day for the sun - 13:32 on Friday 13th January 2012. Digital Image No. GMPI10796.