Having arrived earlier from Aylesbury with the shuttle service to Princes Risborough, Chiltern "bubblecar" No. 121 034 failed in the bay platform and could not work the 09:24 return run to Aylesbury. There was the potential for the unit to be rescued by the RHTT "Green Goddess" Class 117 DMU as locos cannot tow the unit due to different braking systems. While a minibus was being sorted out for the passengers on the platform, fitters attended from Aylesbury depot - it seemed the unit was low on coolant and the engines shut down. The fitters topped-up the coolant and after successfully re-starting the engines, the train returned as the 10:24 to Aylesbury, albeit somewhat late at 10:31... 10:23, Friday 2nd December 2011. Digital Image No. GMPI10665.