Chiltern "bubblecar" No. 121 034 is just arriving into the bay platform at Princes Risborough with 2P12, the 17:41 from Aylesbury. This unit does not normally work during the evening peak hours but as the revamped service during the partial blockade of the line required the use of every available 165 unit on the trains to Paddington, it was pressed into service. 17:57, Tuesday 16th August 2011. Digital Image No. GMPI10054.