Running light engine as 0Z20, Class 20 Bo-Bo No. 20227 passes Princes Risborough on the new through line, working from Bescot to West Ruislip. The trip should have comprised two locos, but the other was unavaialble, meaning this loco unusually ran nose first. 13:50, Thursday 29th December 2011. Digital Image No. GMPI10740.