 The eight @-@ car configuration of the S Stock design includes open connections between the passenger cars , and thus cannot be split into shorter four @-@ car trains capable of fitting into the bay platform at Chalfont & Latimer station . Consequently , in 2008 TfL announced that the shuttle service was to be abandoned . Instead , the long @-@ standing Metropolitan line service of four trains per hour to and from Amersham was to be reduced to two , with the other two services running as through trains between London and Chesham . After 118 years of service on 11 December 2010 at 12 @.@ 37 pm the last Chesham shuttle service left Chesham station . A Stock trains continued to run on the line , providing through services to London , until 29 September 2012 when they were retired and replaced by S8 Stock trains . 
