 The station at Chalfont Road was built with almost all facilities on the up side ( the London @-@ bound platform ) . As Chalfont St Giles , the largest nearby settlement , was on the other side of the tracks , most passengers travelling to and from the station were obliged to take a lengthy detour from the single exit . A footpath across the tracks was added in 1925 , but an approach road giving access to the station from the southern side of the railway line was not built until 1933 . The station had three platforms ; one platform in each direction on the London – Aylesbury line , and a bay platform alongside the up platform for trains to Chesham . A run @-@ around loop was built to allow locomotives reversing in the bay platform always to be at the front of their trains . It was built outside the station , meaning locomotives reversing on the Chesham line were obliged to push their trains out of the station before performing the manoeuvre . 
