 The station was renamed " Chalfont & Latimer " in 1915 , although station signage was inconsistent and on absorption by London Transport in 1933 its roundel signs read simply " Chalfont " . Increased passenger numbers strained the station 's minimal facilities , and it was eventually redeveloped with extended shelters and improved waiting rooms in 1927 . The platforms were extended during the electrification works of 1957 – 60 . 
